{
  "metadata": {
    "name": "High Lift vs Vertical Lift: Manufacturer Clearance Crosswalk",
    "version": "1.0.0",
    "verified_on": "2026-09-16",
    "verification_timezone": "UTC",
    "creator": "Rockford Dock Door Repair Research",
    "description": "Original compilation of source-specific published dimensions, conditional arithmetic and source discrepancies; not original field measurements or a fit approval.",
    "canonical_page": "https://rockforddockdoorrepair.com/research/high-lift-vs-vertical-lift/",
    "variables": {
      "D": "Door height in inches",
      "O": "Opening height in inches",
      "L": "High-lift dimension using the cited drawing datum",
      "H": "Headroom above the applicable opening/door reference",
      "C": "Floor-to-obstruction dimension; examples assume O=D and use C=O+H"
    },
    "missing_values": "JSON null / blank CSV means not supplied, not applicable, ambiguous or deliberately excluded as specified in the row. It never means zero.",
    "row_counts": {
      "clearance_records": 50,
      "calculated_examples": 47,
      "source_conflicts": 12,
      "primary_sources": 24
    }
  },
  "clearance_records": [
    {
      "record_id": "R001",
      "manufacturer": "Clopay",
      "document": "Installation & Maintenance — Commercial & Industrial Sectional Doors, P/N 0130006",
      "document_revision": "06/12",
      "configuration": "Standard lift, 12-inch radius",
      "track_size_in": 2,
      "headroom_formula": "14.5",
      "headroom_base_in": 14.5,
      "headroom_literal": null,
      "backroom_formula": "D+23",
      "backroom_fixed_in": null,
      "sideroom_in": 4.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "This 2012 manual instructs against jackshaft operators on standard lift and low headroom; see ANSI/DASMA 102-2018 and TDS 1501 for the conditional standard-lift provisions.",
      "qualifiers": "Approximate 2012 chart. Additional allowances can apply for doors >18 ft, >1000 lb springing weight, high-cycle springs, multiple spring rows and operators. Straight-incline vertical lift requires additional headroom. Not an orderability or installation approval.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R002",
      "manufacturer": "Clopay",
      "document": "Installation & Maintenance — Commercial & Industrial Sectional Doors, P/N 0130006",
      "document_revision": "06/12",
      "configuration": "Standard lift, 12-inch radius",
      "track_size_in": 3,
      "headroom_formula": null,
      "headroom_base_in": null,
      "headroom_literal": "N/A",
      "backroom_formula": "D+25",
      "backroom_fixed_in": null,
      "sideroom_in": 5.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "This 2012 manual instructs against jackshaft operators on standard lift and low headroom; see ANSI/DASMA 102-2018 and TDS 1501 for the conditional standard-lift provisions.",
      "qualifiers": "Approximate 2012 chart. Additional allowances can apply for doors >18 ft, >1000 lb springing weight, high-cycle springs, multiple spring rows and operators. Straight-incline vertical lift requires additional headroom. Not an orderability or installation approval. The manual still prints sideroom/backroom in this column; N/A headroom does not establish a 3-inch 12-radius configuration.",
      "calculation_status": "configuration_marked_not_available",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R003",
      "manufacturer": "Clopay",
      "document": "Installation & Maintenance — Commercial & Industrial Sectional Doors, P/N 0130006",
      "document_revision": "06/12",
      "configuration": "Standard lift, 15-inch radius",
      "track_size_in": 2,
      "headroom_formula": "16",
      "headroom_base_in": 16,
      "headroom_literal": null,
      "backroom_formula": "D+23",
      "backroom_fixed_in": null,
      "sideroom_in": 4.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "This 2012 manual instructs against jackshaft operators on standard lift and low headroom; see ANSI/DASMA 102-2018 and TDS 1501 for the conditional standard-lift provisions.",
      "qualifiers": "Approximate 2012 chart. Additional allowances can apply for doors >18 ft, >1000 lb springing weight, high-cycle springs, multiple spring rows and operators. Straight-incline vertical lift requires additional headroom. Not an orderability or installation approval.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R004",
      "manufacturer": "Clopay",
      "document": "Installation & Maintenance — Commercial & Industrial Sectional Doors, P/N 0130006",
      "document_revision": "06/12",
      "configuration": "Standard lift, 15-inch radius",
      "track_size_in": 3,
      "headroom_formula": "18",
      "headroom_base_in": 18,
      "headroom_literal": null,
      "backroom_formula": "D+25",
      "backroom_fixed_in": null,
      "sideroom_in": 5.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "This 2012 manual instructs against jackshaft operators on standard lift and low headroom; see ANSI/DASMA 102-2018 and TDS 1501 for the conditional standard-lift provisions.",
      "qualifiers": "Approximate 2012 chart. Additional allowances can apply for doors >18 ft, >1000 lb springing weight, high-cycle springs, multiple spring rows and operators. Straight-incline vertical lift requires additional headroom. Not an orderability or installation approval.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R005",
      "manufacturer": "Clopay",
      "document": "Installation & Maintenance — Commercial & Industrial Sectional Doors, P/N 0130006",
      "document_revision": "06/12",
      "configuration": "Low headroom, rear torsion",
      "track_size_in": 2,
      "headroom_formula": "6.5",
      "headroom_base_in": 6.5,
      "headroom_literal": null,
      "backroom_formula": "D+30",
      "backroom_fixed_in": null,
      "sideroom_in": 6,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "This 2012 manual instructs against jackshaft operators on standard lift and low headroom; see ANSI/DASMA 102-2018 and TDS 1501 for the conditional standard-lift provisions.",
      "qualifiers": "Approximate 2012 chart. Additional allowances can apply for doors >18 ft, >1000 lb springing weight, high-cycle springs, multiple spring rows and operators. Straight-incline vertical lift requires additional headroom. Not an orderability or installation approval.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R006",
      "manufacturer": "Clopay",
      "document": "Installation & Maintenance — Commercial & Industrial Sectional Doors, P/N 0130006",
      "document_revision": "06/12",
      "configuration": "Low headroom, rear torsion",
      "track_size_in": 3,
      "headroom_formula": "10",
      "headroom_base_in": 10,
      "headroom_literal": null,
      "backroom_formula": "D+32",
      "backroom_fixed_in": null,
      "sideroom_in": 6.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "This 2012 manual instructs against jackshaft operators on standard lift and low headroom; see ANSI/DASMA 102-2018 and TDS 1501 for the conditional standard-lift provisions.",
      "qualifiers": "Approximate 2012 chart. Additional allowances can apply for doors >18 ft, >1000 lb springing weight, high-cycle springs, multiple spring rows and operators. Straight-incline vertical lift requires additional headroom. Not an orderability or installation approval.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R007",
      "manufacturer": "Clopay",
      "document": "Installation & Maintenance — Commercial & Industrial Sectional Doors, P/N 0130006",
      "document_revision": "06/12",
      "configuration": "Low headroom, front torsion",
      "track_size_in": 2,
      "headroom_formula": "10",
      "headroom_base_in": 10,
      "headroom_literal": null,
      "backroom_formula": "D+23",
      "backroom_fixed_in": null,
      "sideroom_in": 6,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "This 2012 manual instructs against jackshaft operators on standard lift and low headroom; see ANSI/DASMA 102-2018 and TDS 1501 for the conditional standard-lift provisions.",
      "qualifiers": "Approximate 2012 chart. Additional allowances can apply for doors >18 ft, >1000 lb springing weight, high-cycle springs, multiple spring rows and operators. Straight-incline vertical lift requires additional headroom. Not an orderability or installation approval.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R008",
      "manufacturer": "Clopay",
      "document": "Installation & Maintenance — Commercial & Industrial Sectional Doors, P/N 0130006",
      "document_revision": "06/12",
      "configuration": "Low headroom, front torsion",
      "track_size_in": 3,
      "headroom_formula": "13",
      "headroom_base_in": 13,
      "headroom_literal": null,
      "backroom_formula": "D+25",
      "backroom_fixed_in": null,
      "sideroom_in": 6.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "This 2012 manual instructs against jackshaft operators on standard lift and low headroom; see ANSI/DASMA 102-2018 and TDS 1501 for the conditional standard-lift provisions.",
      "qualifiers": "Approximate 2012 chart. Additional allowances can apply for doors >18 ft, >1000 lb springing weight, high-cycle springs, multiple spring rows and operators. Straight-incline vertical lift requires additional headroom. Not an orderability or installation approval.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R009",
      "manufacturer": "Clopay",
      "document": "Installation & Maintenance — Commercial & Industrial Sectional Doors, P/N 0130006",
      "document_revision": "06/12",
      "configuration": "High lift",
      "track_size_in": 2,
      "headroom_formula": "L+12",
      "headroom_base_in": 12,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 4.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Approximate 2012 chart. Additional allowances can apply for doors >18 ft, >1000 lb springing weight, high-cycle springs, multiple spring rows and operators. Straight-incline vertical lift requires additional headroom. Not an orderability or installation approval. Manual lists backroom as Varies.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R010",
      "manufacturer": "Clopay",
      "document": "Installation & Maintenance — Commercial & Industrial Sectional Doors, P/N 0130006",
      "document_revision": "06/12",
      "configuration": "High lift",
      "track_size_in": 3,
      "headroom_formula": "L+12",
      "headroom_base_in": 12,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Approximate 2012 chart. Additional allowances can apply for doors >18 ft, >1000 lb springing weight, high-cycle springs, multiple spring rows and operators. Straight-incline vertical lift requires additional headroom. Not an orderability or installation approval. Manual lists backroom as Varies.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R011",
      "manufacturer": "Clopay",
      "document": "Installation & Maintenance — Commercial & Industrial Sectional Doors, P/N 0130006",
      "document_revision": "06/12",
      "configuration": "Vertical lift",
      "track_size_in": 2,
      "headroom_formula": "D+12",
      "headroom_base_in": 12,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": 23,
      "sideroom_in": 4.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Approximate 2012 chart. Additional allowances can apply for doors >18 ft, >1000 lb springing weight, high-cycle springs, multiple spring rows and operators. Straight-incline vertical lift requires additional headroom. Not an orderability or installation approval.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R012",
      "manufacturer": "Clopay",
      "document": "Installation & Maintenance — Commercial & Industrial Sectional Doors, P/N 0130006",
      "document_revision": "06/12",
      "configuration": "Vertical lift",
      "track_size_in": 3,
      "headroom_formula": "D+12",
      "headroom_base_in": 12,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": 25,
      "sideroom_in": 5.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Approximate 2012 chart. Additional allowances can apply for doors >18 ft, >1000 lb springing weight, high-cycle springs, multiple spring rows and operators. Straight-incline vertical lift requires additional headroom. Not an orderability or installation approval.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R013",
      "manufacturer": "Clopay",
      "document": "High-Lift Track, T-10",
      "document_revision": "Undated",
      "configuration": "High lift, T-10",
      "track_size_in": 2,
      "headroom_formula": "L+12",
      "headroom_base_in": 12,
      "headroom_literal": null,
      "backroom_formula": "O-L+23",
      "backroom_fixed_in": null,
      "sideroom_in": 4.5,
      "center_column_in": 9,
      "approx_spring_centerline_formula": "O+L+8",
      "chain_hoist_allowance_in": 11.5,
      "jackshaft_allowance_formula": "sideroom+30",
      "max_lift_in": 162,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "Drawing states only jackshaft motor operators are available for this track type.",
      "qualifiers": "The drawing does not establish whether L=D is available. Its Opening + High-Lift Height label is not the complete obstruction envelope. Do not merge with the different T-5 backroom and limits.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S02",
      "source_url": "https://cdn.clopay.com/public/High_Lift.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R014",
      "manufacturer": "Clopay",
      "document": "Vertical-Lift Track, T-11",
      "document_revision": "Undated",
      "configuration": "Vertical lift, T-11 baseline",
      "track_size_in": 2,
      "headroom_formula": "D+12",
      "headroom_base_in": 12,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": 25,
      "sideroom_in": 4.5,
      "center_column_in": 9,
      "approx_spring_centerline_formula": "2*O+6",
      "chain_hoist_allowance_in": 11.5,
      "jackshaft_allowance_formula": "sideroom+30",
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "Drawing states jackshaft motor operators are available.",
      "qualifiers": "Total labeled dimension 2*D+12. Straight incline requires an additional 12 inches. No straight-incline maximum height on this sheet; use T-7 limits for the worked comparison.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S03",
      "source_url": "https://cdn.clopay.com/public/Vertical.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R015",
      "manufacturer": "Clopay",
      "document": "High-Lift Track, sheet T-5; file T-5B.pdf",
      "document_revision": "Undated",
      "configuration": "High lift, T-5 breakaway",
      "track_size_in": 2,
      "headroom_formula": "L+12",
      "headroom_base_in": 12,
      "headroom_literal": null,
      "backroom_formula": "D-L+35",
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": "D+L+7",
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": 162,
      "lift_limit_formula": "L<=min(D-24,162,C-(D+12))",
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "Includes a trolley-operator headroom allowance of 4 inches. Operator selection block is labeled for tracks with more than 24 inches high lift; not a blanket operator approval.",
      "qualifiers": "Breakaway high lift available in 3-inch increments. L must not exceed D-24 or 162 inches; available floor-to-ceiling height is an additional limit. Double shafts add 12 inches headroom. Trolley operators add 4 inches headroom. Straight-incline high lift has a separate table.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S08",
      "source_url": "https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R016",
      "manufacturer": "Clopay",
      "document": "Vertical-Lift Track, sheet T-7; file T-7B.pdf",
      "document_revision": "REV. DEC, 2025",
      "configuration": "Vertical lift, T-7 breakaway",
      "track_size_in": 2,
      "headroom_formula": "D+12",
      "headroom_base_in": 12,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": "2*D+6",
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "Drawing includes jackshaft/chain hoist/by others selections; compatibility not inferred from a checkbox.",
      "qualifiers": "Double shafts require an additional 12 inches of headroom. No backroom dimension supplied in the uncompleted order field.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R017",
      "manufacturer": "Clopay",
      "document": "Vertical-Lift Track, sheet T-7; file T-7B.pdf",
      "document_revision": "REV. DEC, 2025",
      "configuration": "Vertical lift, T-7 straight incline",
      "track_size_in": 2,
      "headroom_formula": "D+24",
      "headroom_base_in": 24,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": "2*D+6",
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": 120,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Optional straight-incline configuration limited to 10-foot door height; double shafts add 12 inches headroom.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R018",
      "manufacturer": "Clopay",
      "document": "High-Lift Track, T-10",
      "document_revision": "Undated",
      "configuration": "High lift, T-10",
      "track_size_in": 3,
      "headroom_formula": "L+13",
      "headroom_base_in": 13,
      "headroom_literal": null,
      "backroom_formula": "O-L+25",
      "backroom_fixed_in": null,
      "sideroom_in": 5.5,
      "center_column_in": 11,
      "approx_spring_centerline_formula": "O+L+9",
      "chain_hoist_allowance_in": 12.0,
      "jackshaft_allowance_formula": "sideroom+30",
      "max_lift_in": 162,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "Drawing states only jackshaft motor operators are available for this track type.",
      "qualifiers": "The drawing does not establish whether L=D is available. Its Opening + High-Lift Height label is not the complete obstruction envelope. Do not merge with the different T-5 backroom and limits.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S02",
      "source_url": "https://cdn.clopay.com/public/High_Lift.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R019",
      "manufacturer": "Clopay",
      "document": "Vertical-Lift Track, T-11",
      "document_revision": "Undated",
      "configuration": "Vertical lift, T-11 baseline",
      "track_size_in": 3,
      "headroom_formula": "D+12",
      "headroom_base_in": 12,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": 25,
      "sideroom_in": 5.5,
      "center_column_in": 11,
      "approx_spring_centerline_formula": "2*O+6",
      "chain_hoist_allowance_in": 12.0,
      "jackshaft_allowance_formula": "sideroom+30",
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "Drawing states jackshaft motor operators are available.",
      "qualifiers": "Total labeled dimension 2*D+12. Straight incline requires an additional 12 inches. No straight-incline maximum height on this sheet; use T-7 limits for the worked comparison.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S03",
      "source_url": "https://cdn.clopay.com/public/Vertical.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R020",
      "manufacturer": "Clopay",
      "document": "High-Lift Track, sheet T-5; file T-5B.pdf",
      "document_revision": "Undated",
      "configuration": "High lift, T-5 breakaway",
      "track_size_in": 3,
      "headroom_formula": "L+12",
      "headroom_base_in": 12,
      "headroom_literal": null,
      "backroom_formula": "D-L+38",
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": "D+L+7",
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": 162,
      "lift_limit_formula": "L<=min(D-24,162,C-(D+12))",
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "Includes a trolley-operator headroom allowance of 4 inches. Operator selection block is labeled for tracks with more than 24 inches high lift; not a blanket operator approval.",
      "qualifiers": "Breakaway high lift available in 3-inch increments. L must not exceed D-24 or 162 inches; available floor-to-ceiling height is an additional limit. Double shafts add 12 inches headroom. Trolley operators add 4 inches headroom. Straight-incline high lift has a separate table.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S08",
      "source_url": "https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R021",
      "manufacturer": "Clopay",
      "document": "Vertical-Lift Track, sheet T-7; file T-7B.pdf",
      "document_revision": "REV. DEC, 2025",
      "configuration": "Vertical lift, T-7 breakaway",
      "track_size_in": 3,
      "headroom_formula": "D+12",
      "headroom_base_in": 12,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": "2*D+6",
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "Drawing includes jackshaft/chain hoist/by others selections; compatibility not inferred from a checkbox.",
      "qualifiers": "Double shafts require an additional 12 inches of headroom. No backroom dimension supplied in the uncompleted order field.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R022",
      "manufacturer": "Clopay",
      "document": "Vertical-Lift Track, sheet T-7; file T-7B.pdf",
      "document_revision": "REV. DEC, 2025",
      "configuration": "Vertical lift, T-7 straight incline",
      "track_size_in": 3,
      "headroom_formula": "D+24",
      "headroom_base_in": 24,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": "2*D+6",
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": 120,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Optional straight-incline configuration limited to 10-foot door height; double shafts add 12 inches headroom.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R023",
      "manufacturer": "Clopay",
      "document": "High-Lift Track, sheet T-5; file T-5B.pdf",
      "document_revision": "Undated",
      "configuration": "High lift, T-5 straight incline at door height 168 inches",
      "track_size_in": null,
      "headroom_formula": null,
      "headroom_base_in": null,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": 64,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Separate straight-incline limit table: D=168 inches; do not apply this row to other door heights or treat it as breakaway high lift.",
      "calculation_status": "constraint_only",
      "source_id": "S08",
      "source_url": "https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R024",
      "manufacturer": "Clopay",
      "document": "High-Lift Track, sheet T-5; file T-5B.pdf",
      "document_revision": "Undated",
      "configuration": "High lift, T-5 straight incline at door height 180 inches",
      "track_size_in": null,
      "headroom_formula": null,
      "headroom_base_in": null,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": 43,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Separate straight-incline limit table: D=180 inches; do not apply this row to other door heights or treat it as breakaway high lift.",
      "calculation_status": "constraint_only",
      "source_id": "S08",
      "source_url": "https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R025",
      "manufacturer": "Clopay",
      "document": "High-Lift Track, sheet T-5; file T-5B.pdf",
      "document_revision": "Undated",
      "configuration": "High lift, T-5 straight incline at door height 192 inches",
      "track_size_in": null,
      "headroom_formula": null,
      "headroom_base_in": null,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": 31,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Separate straight-incline limit table: D=192 inches; do not apply this row to other door heights or treat it as breakaway high lift.",
      "calculation_status": "constraint_only",
      "source_id": "S08",
      "source_url": "https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R026",
      "manufacturer": "Amarr",
      "document": "Lift Options for Commercial Garage Doors",
      "document_revision": "Undated",
      "configuration": "Vertical lift, generic table",
      "track_size_in": 2,
      "headroom_formula": null,
      "headroom_base_in": null,
      "headroom_literal": "Door Height = +13",
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Malformed equation preserved. No corrected formula inferred; use the separate Rapid Install row for calculations.",
      "calculation_status": "excluded_ambiguous_formula",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R027",
      "manufacturer": "Amarr",
      "document": "Lift Options for Commercial Garage Doors",
      "document_revision": "Undated",
      "configuration": "Rapid Install Vertical Lift",
      "track_size_in": 2,
      "headroom_formula": "D+13",
      "headroom_base_in": 13,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": 120,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Product described for doors up to 112 inches wide by 120 inches high; other constraints and operators still need project documentation.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R028",
      "manufacturer": "Amarr",
      "document": "Lift Options for Commercial Garage Doors",
      "document_revision": "Undated",
      "configuration": "High lift",
      "track_size_in": 2,
      "headroom_formula": null,
      "headroom_base_in": 12.5,
      "headroom_literal": "12-1/2 inches",
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "These are the numbers printed under Headroom Required. The page does not state a complete formula involving L, so no L+constant expression is invented.",
      "calculation_status": "excluded_incomplete_datum",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R029",
      "manufacturer": "Amarr",
      "document": "Lift Options for Commercial Garage Doors",
      "document_revision": "Undated",
      "configuration": "Vertical lift, generic table",
      "track_size_in": 3,
      "headroom_formula": null,
      "headroom_base_in": null,
      "headroom_literal": "Door Height = +13",
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Malformed equation preserved. No corrected formula inferred; use the separate Rapid Install row for calculations.",
      "calculation_status": "excluded_ambiguous_formula",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R030",
      "manufacturer": "Amarr",
      "document": "Lift Options for Commercial Garage Doors",
      "document_revision": "Undated",
      "configuration": "Rapid Install Vertical Lift",
      "track_size_in": 3,
      "headroom_formula": "D+13",
      "headroom_base_in": 13,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": 120,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Product described for doors up to 112 inches wide by 120 inches high; other constraints and operators still need project documentation.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R031",
      "manufacturer": "Amarr",
      "document": "Lift Options for Commercial Garage Doors",
      "document_revision": "Undated",
      "configuration": "High lift",
      "track_size_in": 3,
      "headroom_formula": null,
      "headroom_base_in": 13.5,
      "headroom_literal": "13-1/2 inches",
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "These are the numbers printed under Headroom Required. The page does not state a complete formula involving L, so no L+constant expression is invented.",
      "calculation_status": "excluded_incomplete_datum",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R032",
      "manufacturer": "Amarr",
      "document": "Lift Options for Commercial Garage Doors",
      "document_revision": "Undated",
      "configuration": "Standard lift, 12-inch radius",
      "track_size_in": 2,
      "headroom_formula": "12.75",
      "headroom_base_in": 12.75,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": null,
      "calculation_status": "document_specific_baseline",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R033",
      "manufacturer": "Amarr",
      "document": "Lift Options for Commercial Garage Doors",
      "document_revision": "Undated",
      "configuration": "Standard lift, 15-inch radius",
      "track_size_in": 2,
      "headroom_formula": "15.5",
      "headroom_base_in": 15.5,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": null,
      "calculation_status": "document_specific_baseline",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R034",
      "manufacturer": "Amarr",
      "document": "Lift Options for Commercial Garage Doors",
      "document_revision": "Undated",
      "configuration": "Standard lift, radius not specified",
      "track_size_in": 3,
      "headroom_formula": "16.875",
      "headroom_base_in": 16.875,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": null,
      "calculation_status": "document_specific_baseline",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R035",
      "manufacturer": "Amarr",
      "document": "Lift Options for Commercial Garage Doors",
      "document_revision": "Undated",
      "configuration": "Low headroom, rear mount",
      "track_size_in": 2,
      "headroom_formula": "6.5",
      "headroom_base_in": 6.5,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Context record supporting the seven-configuration sideroom comparison; not used for cross-manufacturer averages.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R036",
      "manufacturer": "Amarr",
      "document": "Lift Options for Commercial Garage Doors",
      "document_revision": "Undated",
      "configuration": "Low headroom, rear mount",
      "track_size_in": 3,
      "headroom_formula": "7.625",
      "headroom_base_in": 7.625,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Context record supporting the seven-configuration sideroom comparison; not used for cross-manufacturer averages.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R037",
      "manufacturer": "Amarr",
      "document": "Lift Options for Commercial Garage Doors",
      "document_revision": "Undated",
      "configuration": "Low headroom, front mount",
      "track_size_in": 2,
      "headroom_formula": "12.8125",
      "headroom_base_in": 12.8125,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Context record supporting the seven-configuration sideroom comparison; not used for cross-manufacturer averages.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R038",
      "manufacturer": "Amarr",
      "document": "Lift Options for Commercial Garage Doors",
      "document_revision": "Undated",
      "configuration": "Low headroom, front mount",
      "track_size_in": 3,
      "headroom_formula": "16.875",
      "headroom_base_in": 16.875,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Context record supporting the seven-configuration sideroom comparison; not used for cross-manufacturer averages.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R039",
      "manufacturer": "Amarr",
      "document": "Lift Options for Commercial Garage Doors",
      "document_revision": "Undated",
      "configuration": "Follow the roof pitch, 15-inch radius for 2-inch track",
      "track_size_in": 2,
      "headroom_formula": "15.5",
      "headroom_base_in": 15.5,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Context record supporting the seven-configuration sideroom comparison; not used for cross-manufacturer averages.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R040",
      "manufacturer": "Amarr",
      "document": "Lift Options for Commercial Garage Doors",
      "document_revision": "Undated",
      "configuration": "Follow the roof pitch, 15-inch radius for 2-inch track",
      "track_size_in": 3,
      "headroom_formula": "16.875",
      "headroom_base_in": 16.875,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": 5.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Context record supporting the seven-configuration sideroom comparison; not used for cross-manufacturer averages.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R041",
      "manufacturer": "C.H.I. Overhead Doors",
      "document": "Model 3241 three-part specification, Section 08 36 00 / 08360",
      "document_revision": "2024-06-28 date encoded in filename; not asserted to be a printed revision",
      "configuration": "Model 3241 — High lift",
      "track_size_in": null,
      "headroom_formula": null,
      "headroom_base_in": null,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": 120,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": 300,
      "operator_restriction": null,
      "qualifiers": "Model-specific factory-consultation trigger, not a published product ceiling or approval for all sizes below the trigger.",
      "calculation_status": "consultation_threshold_not_maximum",
      "source_id": "S10",
      "source_url": "https://www.chiohd.com/hubfs/3%20part%20spec%20pdf/20240628-01_CHI_Specification_3P_08360_3241.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R042",
      "manufacturer": "C.H.I. Overhead Doors",
      "document": "Model 3241 three-part specification, Section 08 36 00 / 08360",
      "document_revision": "2024-06-28 date encoded in filename; not asserted to be a printed revision",
      "configuration": "Model 3241 — Vertical lift",
      "track_size_in": null,
      "headroom_formula": null,
      "headroom_base_in": null,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": 192,
      "consult_above_opening_area_sq_ft": 300,
      "operator_restriction": null,
      "qualifiers": "Model-specific factory-consultation trigger, not a published product ceiling or approval for all sizes below the trigger.",
      "calculation_status": "consultation_threshold_not_maximum",
      "source_id": "S10",
      "source_url": "https://www.chiohd.com/hubfs/3%20part%20spec%20pdf/20240628-01_CHI_Specification_3P_08360_3241.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R043",
      "manufacturer": "C.H.I. Overhead Doors",
      "document": "Model 3241 three-part specification, Section 08 36 00 / 08360",
      "document_revision": "2024-06-28 date encoded in filename; not asserted to be a printed revision",
      "configuration": "Model 3241 — Standard lift, 15-inch radius",
      "track_size_in": null,
      "headroom_formula": null,
      "headroom_base_in": null,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": 300,
      "operator_restriction": null,
      "qualifiers": "Model-specific factory-consultation trigger, not a published product ceiling or approval for all sizes below the trigger.",
      "calculation_status": "consultation_threshold_not_maximum",
      "source_id": "S10",
      "source_url": "https://www.chiohd.com/hubfs/3%20part%20spec%20pdf/20240628-01_CHI_Specification_3P_08360_3241.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R044",
      "manufacturer": "C.H.I. Overhead Doors",
      "document": "Model 3241 three-part specification, Section 08 36 00 / 08360",
      "document_revision": "2024-06-28 date encoded in filename; not asserted to be a printed revision",
      "configuration": "Model 3241 — chain hoist option",
      "track_size_in": null,
      "headroom_formula": null,
      "headroom_base_in": null,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "Not available for standard lift or low headroom track options in this specification.",
      "qualifiers": null,
      "calculation_status": "operator_scope_only",
      "source_id": "S10",
      "source_url": "https://www.chiohd.com/hubfs/3%20part%20spec%20pdf/20240628-01_CHI_Specification_3P_08360_3241.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R045",
      "manufacturer": "Clopay",
      "document": "Low Headroom Track (Rear Mount Springs), T-9",
      "document_revision": "Undated",
      "configuration": "Low headroom, rear mount — Clopay",
      "track_size_in": 2,
      "headroom_formula": "4.5",
      "headroom_base_in": 4.5,
      "headroom_literal": null,
      "backroom_formula": "D+30",
      "backroom_fixed_in": null,
      "sideroom_in": 6,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "Trolley-type motor operators only on this drawing.",
      "qualifiers": "Prose: trolley adds 4 inches backroom. Table: Trolley Operator / Headroom+4. Labels conflict; neither interpretation is silently substituted.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S05",
      "source_url": "https://cdn.clopay.com/public/Low_Headroom_Rear.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R046",
      "manufacturer": "Clopay",
      "document": "Low Headroom Track (Rear Mount Springs), T-9",
      "document_revision": "Undated",
      "configuration": "Low headroom, rear mount — Clopay",
      "track_size_in": 3,
      "headroom_formula": "10",
      "headroom_base_in": 10,
      "headroom_literal": null,
      "backroom_formula": "D+32",
      "backroom_fixed_in": null,
      "sideroom_in": 6.5,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": "Trolley-type motor operators only on this drawing.",
      "qualifiers": "Prose: trolley adds 4 inches backroom. Table: Trolley Operator / Headroom+4. Labels conflict; neither interpretation is silently substituted.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S05",
      "source_url": "https://cdn.clopay.com/public/Low_Headroom_Rear.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R047",
      "manufacturer": "Clopay",
      "document": "Low Headroom Track (Rear Mount Springs), T-9",
      "document_revision": "Undated",
      "configuration": "Low headroom, rear mount — Ideal Door label",
      "track_size_in": 2,
      "headroom_formula": "6.5",
      "headroom_base_in": 6.5,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Brand-specific label on the Clopay-hosted T-9 sheet; not silently substituted for the Clopay 4.5-inch value.",
      "calculation_status": "document_specific_baseline",
      "source_id": "S05",
      "source_url": "https://cdn.clopay.com/public/Low_Headroom_Rear.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R048",
      "manufacturer": "Clopay",
      "document": "Follow-the-Roof Track, T-12",
      "document_revision": "Undated",
      "configuration": "Follow-the-roof track, T-12",
      "track_size_in": 2,
      "headroom_formula": null,
      "headroom_base_in": null,
      "headroom_literal": "Diagram: 16 inches above opening; table: Door Ht + 16",
      "backroom_formula": "D-L+25",
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Separate labels on the same sheet are preserved; no numeric headroom formula normalized for the comparison. Optional high lift refers to high-lift dimensions.",
      "calculation_status": "excluded_conflicting_dimension_labels",
      "source_id": "S06",
      "source_url": "https://cdn.clopay.com/public/follow_the_roof.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R049",
      "manufacturer": "Clopay",
      "document": "Follow-the-Roof Track, T-12",
      "document_revision": "Undated",
      "configuration": "Follow-the-roof track, T-12",
      "track_size_in": 3,
      "headroom_formula": null,
      "headroom_base_in": null,
      "headroom_literal": "Diagram: 18 inches above opening; table: Door Ht + 18",
      "backroom_formula": "D-L+25",
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Separate labels on the same sheet are preserved; no numeric headroom formula normalized for the comparison. Optional high lift refers to high-lift dimensions.",
      "calculation_status": "excluded_conflicting_dimension_labels",
      "source_id": "S06",
      "source_url": "https://cdn.clopay.com/public/follow_the_roof.pdf",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    },
    {
      "record_id": "R050",
      "manufacturer": "Clopay",
      "document": "Residential Garage Door Track Options",
      "document_revision": "Undated",
      "configuration": "Residential guide high lift",
      "track_size_in": null,
      "headroom_formula": "L+9.5 or greater",
      "headroom_base_in": 9.5,
      "headroom_literal": null,
      "backroom_formula": null,
      "backroom_fixed_in": null,
      "sideroom_in": null,
      "center_column_in": null,
      "approx_spring_centerline_formula": null,
      "chain_hoist_allowance_in": null,
      "jackshaft_allowance_formula": null,
      "max_lift_in": null,
      "lift_limit_formula": null,
      "max_door_height_in": null,
      "consult_above_lift_in": null,
      "consult_above_door_height_in": null,
      "consult_above_opening_area_sq_ft": null,
      "operator_restriction": null,
      "qualifiers": "Residential-facing guide says at least 9.5 inches above the lift dimension. Not substituted into commercial drawings.",
      "calculation_status": "context_only_not_commercial_input",
      "source_id": "S04",
      "source_url": "https://www.clopaydoor.com/buyingguide/garage-door-track-options",
      "verified_on": "2026-09-16",
      "verification_tier": "direct_primary_review"
    }
  ],
  "calculated_examples": [
    {
      "example_id": "CE-96",
      "door_height_in": 96,
      "opening_height_in": 96,
      "configuration": "Algebraic crossover test — excluded by T-5 breakaway limits",
      "high_lift_in": 96,
      "headroom_in": 108,
      "floor_to_obstruction_in": 204,
      "floor_to_obstruction_ft_in": "17 ft 0 in",
      "backroom_in": 23,
      "arithmetic": "H_high=96+12=108; H_vertical=96+12=108; B_T10_2in=96-96+23=23; B_manual_vertical_2in=23",
      "source_formula": "H_high=L+12; H_vertical=D+12; B_high_2=O-L+23; B_vertical_2=23",
      "source_id": "S01;S02;S08",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf;https://cdn.clopay.com/public/High_Lift.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "algebra_only_outside_T5_limit",
      "notes": "The high-lift and vertical backroom expressions come from different documents; T-11 gives 25 inches. All L=D rows exceed T-5 breakaway D-24; 168 and 192 also exceed T-10 162-inch cap.",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "LM-96",
      "door_height_in": 96,
      "opening_height_in": 96,
      "configuration": "T-5 breakaway ceiling-independent lift upper bound",
      "high_lift_in": 72,
      "headroom_in": 84,
      "floor_to_obstruction_in": 180,
      "floor_to_obstruction_ft_in": "15 ft 0 in",
      "backroom_in": null,
      "arithmetic": "L_bound=min(96-24,162)=72; H_high=72+12=84; H_vertical=96+12=108; difference=108-84=24",
      "source_formula": "L_bound=min(D-24,162); H_high=L_bound+12; H_vertical=D+12",
      "source_id": "S08;S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-5B.pdf;https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "Ceiling-independent upper bound, not an orderable maximum. Available building height and all other drawing conditions can reduce the lift further.",
      "verified_on": "2026-09-16",
      "vertical_comparison_headroom_in": 108,
      "headroom_difference_in": 24
    },
    {
      "example_id": "FC-ST-96",
      "door_height_in": 96,
      "opening_height_in": 96,
      "configuration": "Standard lift, 15-inch radius, 3-inch track",
      "high_lift_in": null,
      "headroom_in": 18,
      "floor_to_obstruction_in": 114,
      "floor_to_obstruction_ft_in": "9 ft 6 in",
      "backroom_in": null,
      "arithmetic": "C=96+18=114",
      "source_formula": "H=18",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-HL48-96",
      "door_height_in": 96,
      "opening_height_in": 96,
      "configuration": "High lift, 48 inches, 2-inch track",
      "high_lift_in": 48,
      "headroom_in": 60,
      "floor_to_obstruction_in": 156,
      "floor_to_obstruction_ft_in": "13 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=96+60=156",
      "source_formula": "H=48+12",
      "source_id": "S02;S08",
      "source_url": "https://cdn.clopay.com/public/High_Lift.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-HLCE-96",
      "door_height_in": 96,
      "opening_height_in": 96,
      "configuration": "Hypothetical high lift at L=D — excluded by T-5",
      "high_lift_in": 96,
      "headroom_in": 108,
      "floor_to_obstruction_in": 204,
      "floor_to_obstruction_ft_in": "17 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=96+108=204",
      "source_formula": "H=D+12",
      "source_id": "S01;S08",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "algebra_only_outside_T5_limit",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-VB-96",
      "door_height_in": 96,
      "opening_height_in": 96,
      "configuration": "Vertical lift, T-7 breakaway",
      "high_lift_in": null,
      "headroom_in": 108,
      "floor_to_obstruction_in": 204,
      "floor_to_obstruction_ft_in": "17 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=96+108=204",
      "source_formula": "H=D+12",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-VSI-96",
      "door_height_in": 96,
      "opening_height_in": 96,
      "configuration": "Vertical lift, T-7 straight incline",
      "high_lift_in": null,
      "headroom_in": 120,
      "floor_to_obstruction_in": 216,
      "floor_to_obstruction_ft_in": "18 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=96+120=216",
      "source_formula": "H=D+24 for D<=120 only",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "CE-108",
      "door_height_in": 108,
      "opening_height_in": 108,
      "configuration": "Algebraic crossover test — excluded by T-5 breakaway limits",
      "high_lift_in": 108,
      "headroom_in": 120,
      "floor_to_obstruction_in": 228,
      "floor_to_obstruction_ft_in": "19 ft 0 in",
      "backroom_in": 23,
      "arithmetic": "H_high=108+12=120; H_vertical=108+12=120; B_T10_2in=108-108+23=23; B_manual_vertical_2in=23",
      "source_formula": "H_high=L+12; H_vertical=D+12; B_high_2=O-L+23; B_vertical_2=23",
      "source_id": "S01;S02;S08",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf;https://cdn.clopay.com/public/High_Lift.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "algebra_only_outside_T5_limit",
      "notes": "The high-lift and vertical backroom expressions come from different documents; T-11 gives 25 inches. All L=D rows exceed T-5 breakaway D-24; 168 and 192 also exceed T-10 162-inch cap.",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "LM-108",
      "door_height_in": 108,
      "opening_height_in": 108,
      "configuration": "T-5 breakaway ceiling-independent lift upper bound",
      "high_lift_in": 84,
      "headroom_in": 96,
      "floor_to_obstruction_in": 204,
      "floor_to_obstruction_ft_in": "17 ft 0 in",
      "backroom_in": null,
      "arithmetic": "L_bound=min(108-24,162)=84; H_high=84+12=96; H_vertical=108+12=120; difference=120-96=24",
      "source_formula": "L_bound=min(D-24,162); H_high=L_bound+12; H_vertical=D+12",
      "source_id": "S08;S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-5B.pdf;https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "Ceiling-independent upper bound, not an orderable maximum. Available building height and all other drawing conditions can reduce the lift further.",
      "verified_on": "2026-09-16",
      "vertical_comparison_headroom_in": 120,
      "headroom_difference_in": 24
    },
    {
      "example_id": "FC-ST-108",
      "door_height_in": 108,
      "opening_height_in": 108,
      "configuration": "Standard lift, 15-inch radius, 3-inch track",
      "high_lift_in": null,
      "headroom_in": 18,
      "floor_to_obstruction_in": 126,
      "floor_to_obstruction_ft_in": "10 ft 6 in",
      "backroom_in": null,
      "arithmetic": "C=108+18=126",
      "source_formula": "H=18",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-HL48-108",
      "door_height_in": 108,
      "opening_height_in": 108,
      "configuration": "High lift, 48 inches, 2-inch track",
      "high_lift_in": 48,
      "headroom_in": 60,
      "floor_to_obstruction_in": 168,
      "floor_to_obstruction_ft_in": "14 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=108+60=168",
      "source_formula": "H=48+12",
      "source_id": "S02;S08",
      "source_url": "https://cdn.clopay.com/public/High_Lift.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-HLCE-108",
      "door_height_in": 108,
      "opening_height_in": 108,
      "configuration": "Hypothetical high lift at L=D — excluded by T-5",
      "high_lift_in": 108,
      "headroom_in": 120,
      "floor_to_obstruction_in": 228,
      "floor_to_obstruction_ft_in": "19 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=108+120=228",
      "source_formula": "H=D+12",
      "source_id": "S01;S08",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "algebra_only_outside_T5_limit",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-VB-108",
      "door_height_in": 108,
      "opening_height_in": 108,
      "configuration": "Vertical lift, T-7 breakaway",
      "high_lift_in": null,
      "headroom_in": 120,
      "floor_to_obstruction_in": 228,
      "floor_to_obstruction_ft_in": "19 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=108+120=228",
      "source_formula": "H=D+12",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-VSI-108",
      "door_height_in": 108,
      "opening_height_in": 108,
      "configuration": "Vertical lift, T-7 straight incline",
      "high_lift_in": null,
      "headroom_in": 132,
      "floor_to_obstruction_in": 240,
      "floor_to_obstruction_ft_in": "20 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=108+132=240",
      "source_formula": "H=D+24 for D<=120 only",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "CE-120",
      "door_height_in": 120,
      "opening_height_in": 120,
      "configuration": "Algebraic crossover test — excluded by T-5 breakaway limits",
      "high_lift_in": 120,
      "headroom_in": 132,
      "floor_to_obstruction_in": 252,
      "floor_to_obstruction_ft_in": "21 ft 0 in",
      "backroom_in": 23,
      "arithmetic": "H_high=120+12=132; H_vertical=120+12=132; B_T10_2in=120-120+23=23; B_manual_vertical_2in=23",
      "source_formula": "H_high=L+12; H_vertical=D+12; B_high_2=O-L+23; B_vertical_2=23",
      "source_id": "S01;S02;S08",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf;https://cdn.clopay.com/public/High_Lift.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "algebra_only_outside_T5_limit",
      "notes": "The high-lift and vertical backroom expressions come from different documents; T-11 gives 25 inches. All L=D rows exceed T-5 breakaway D-24; 168 and 192 also exceed T-10 162-inch cap.",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "LM-120",
      "door_height_in": 120,
      "opening_height_in": 120,
      "configuration": "T-5 breakaway ceiling-independent lift upper bound",
      "high_lift_in": 96,
      "headroom_in": 108,
      "floor_to_obstruction_in": 228,
      "floor_to_obstruction_ft_in": "19 ft 0 in",
      "backroom_in": null,
      "arithmetic": "L_bound=min(120-24,162)=96; H_high=96+12=108; H_vertical=120+12=132; difference=132-108=24",
      "source_formula": "L_bound=min(D-24,162); H_high=L_bound+12; H_vertical=D+12",
      "source_id": "S08;S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-5B.pdf;https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "Ceiling-independent upper bound, not an orderable maximum. Available building height and all other drawing conditions can reduce the lift further.",
      "verified_on": "2026-09-16",
      "vertical_comparison_headroom_in": 132,
      "headroom_difference_in": 24
    },
    {
      "example_id": "FC-ST-120",
      "door_height_in": 120,
      "opening_height_in": 120,
      "configuration": "Standard lift, 15-inch radius, 3-inch track",
      "high_lift_in": null,
      "headroom_in": 18,
      "floor_to_obstruction_in": 138,
      "floor_to_obstruction_ft_in": "11 ft 6 in",
      "backroom_in": null,
      "arithmetic": "C=120+18=138",
      "source_formula": "H=18",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-HL48-120",
      "door_height_in": 120,
      "opening_height_in": 120,
      "configuration": "High lift, 48 inches, 2-inch track",
      "high_lift_in": 48,
      "headroom_in": 60,
      "floor_to_obstruction_in": 180,
      "floor_to_obstruction_ft_in": "15 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=120+60=180",
      "source_formula": "H=48+12",
      "source_id": "S02;S08",
      "source_url": "https://cdn.clopay.com/public/High_Lift.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-HLCE-120",
      "door_height_in": 120,
      "opening_height_in": 120,
      "configuration": "Hypothetical high lift at L=D — excluded by T-5",
      "high_lift_in": 120,
      "headroom_in": 132,
      "floor_to_obstruction_in": 252,
      "floor_to_obstruction_ft_in": "21 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=120+132=252",
      "source_formula": "H=D+12",
      "source_id": "S01;S08",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "algebra_only_outside_T5_limit",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-VB-120",
      "door_height_in": 120,
      "opening_height_in": 120,
      "configuration": "Vertical lift, T-7 breakaway",
      "high_lift_in": null,
      "headroom_in": 132,
      "floor_to_obstruction_in": 252,
      "floor_to_obstruction_ft_in": "21 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=120+132=252",
      "source_formula": "H=D+12",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-VSI-120",
      "door_height_in": 120,
      "opening_height_in": 120,
      "configuration": "Vertical lift, T-7 straight incline",
      "high_lift_in": null,
      "headroom_in": 144,
      "floor_to_obstruction_in": 264,
      "floor_to_obstruction_ft_in": "22 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=120+144=264",
      "source_formula": "H=D+24 for D<=120 only",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "CE-144",
      "door_height_in": 144,
      "opening_height_in": 144,
      "configuration": "Algebraic crossover test — excluded by T-5 breakaway limits",
      "high_lift_in": 144,
      "headroom_in": 156,
      "floor_to_obstruction_in": 300,
      "floor_to_obstruction_ft_in": "25 ft 0 in",
      "backroom_in": 23,
      "arithmetic": "H_high=144+12=156; H_vertical=144+12=156; B_T10_2in=144-144+23=23; B_manual_vertical_2in=23",
      "source_formula": "H_high=L+12; H_vertical=D+12; B_high_2=O-L+23; B_vertical_2=23",
      "source_id": "S01;S02;S08",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf;https://cdn.clopay.com/public/High_Lift.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "algebra_only_outside_T5_limit",
      "notes": "The high-lift and vertical backroom expressions come from different documents; T-11 gives 25 inches. All L=D rows exceed T-5 breakaway D-24; 168 and 192 also exceed T-10 162-inch cap.",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "LM-144",
      "door_height_in": 144,
      "opening_height_in": 144,
      "configuration": "T-5 breakaway ceiling-independent lift upper bound",
      "high_lift_in": 120,
      "headroom_in": 132,
      "floor_to_obstruction_in": 276,
      "floor_to_obstruction_ft_in": "23 ft 0 in",
      "backroom_in": null,
      "arithmetic": "L_bound=min(144-24,162)=120; H_high=120+12=132; H_vertical=144+12=156; difference=156-132=24",
      "source_formula": "L_bound=min(D-24,162); H_high=L_bound+12; H_vertical=D+12",
      "source_id": "S08;S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-5B.pdf;https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "Ceiling-independent upper bound, not an orderable maximum. Available building height and all other drawing conditions can reduce the lift further.",
      "verified_on": "2026-09-16",
      "vertical_comparison_headroom_in": 156,
      "headroom_difference_in": 24
    },
    {
      "example_id": "FC-ST-144",
      "door_height_in": 144,
      "opening_height_in": 144,
      "configuration": "Standard lift, 15-inch radius, 3-inch track",
      "high_lift_in": null,
      "headroom_in": 18,
      "floor_to_obstruction_in": 162,
      "floor_to_obstruction_ft_in": "13 ft 6 in",
      "backroom_in": null,
      "arithmetic": "C=144+18=162",
      "source_formula": "H=18",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-HL48-144",
      "door_height_in": 144,
      "opening_height_in": 144,
      "configuration": "High lift, 48 inches, 2-inch track",
      "high_lift_in": 48,
      "headroom_in": 60,
      "floor_to_obstruction_in": 204,
      "floor_to_obstruction_ft_in": "17 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=144+60=204",
      "source_formula": "H=48+12",
      "source_id": "S02;S08",
      "source_url": "https://cdn.clopay.com/public/High_Lift.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-HLCE-144",
      "door_height_in": 144,
      "opening_height_in": 144,
      "configuration": "Hypothetical high lift at L=D — excluded by T-5",
      "high_lift_in": 144,
      "headroom_in": 156,
      "floor_to_obstruction_in": 300,
      "floor_to_obstruction_ft_in": "25 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=144+156=300",
      "source_formula": "H=D+12",
      "source_id": "S01;S08",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "algebra_only_outside_T5_limit",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-VB-144",
      "door_height_in": 144,
      "opening_height_in": 144,
      "configuration": "Vertical lift, T-7 breakaway",
      "high_lift_in": null,
      "headroom_in": 156,
      "floor_to_obstruction_in": 300,
      "floor_to_obstruction_ft_in": "25 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=144+156=300",
      "source_formula": "H=D+12",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-VSI-144",
      "door_height_in": 144,
      "opening_height_in": 144,
      "configuration": "Vertical lift, T-7 straight incline",
      "high_lift_in": null,
      "headroom_in": null,
      "floor_to_obstruction_in": null,
      "floor_to_obstruction_ft_in": null,
      "backroom_in": null,
      "arithmetic": "No output: D exceeds T-7 straight-incline limit of 120 inches",
      "source_formula": "H=D+24 for D<=120 only",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "excluded_above_T7_straight_incline_height_limit",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "CE-168",
      "door_height_in": 168,
      "opening_height_in": 168,
      "configuration": "Algebraic crossover test — excluded by T-5 breakaway limits",
      "high_lift_in": 168,
      "headroom_in": 180,
      "floor_to_obstruction_in": 348,
      "floor_to_obstruction_ft_in": "29 ft 0 in",
      "backroom_in": 23,
      "arithmetic": "H_high=168+12=180; H_vertical=168+12=180; B_T10_2in=168-168+23=23; B_manual_vertical_2in=23",
      "source_formula": "H_high=L+12; H_vertical=D+12; B_high_2=O-L+23; B_vertical_2=23",
      "source_id": "S01;S02;S08",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf;https://cdn.clopay.com/public/High_Lift.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "algebra_only_outside_T5_limit",
      "notes": "The high-lift and vertical backroom expressions come from different documents; T-11 gives 25 inches. All L=D rows exceed T-5 breakaway D-24; 168 and 192 also exceed T-10 162-inch cap.",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "LM-168",
      "door_height_in": 168,
      "opening_height_in": 168,
      "configuration": "T-5 breakaway ceiling-independent lift upper bound",
      "high_lift_in": 144,
      "headroom_in": 156,
      "floor_to_obstruction_in": 324,
      "floor_to_obstruction_ft_in": "27 ft 0 in",
      "backroom_in": null,
      "arithmetic": "L_bound=min(168-24,162)=144; H_high=144+12=156; H_vertical=168+12=180; difference=180-156=24",
      "source_formula": "L_bound=min(D-24,162); H_high=L_bound+12; H_vertical=D+12",
      "source_id": "S08;S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-5B.pdf;https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "Ceiling-independent upper bound, not an orderable maximum. Available building height and all other drawing conditions can reduce the lift further.",
      "verified_on": "2026-09-16",
      "vertical_comparison_headroom_in": 180,
      "headroom_difference_in": 24
    },
    {
      "example_id": "FC-ST-168",
      "door_height_in": 168,
      "opening_height_in": 168,
      "configuration": "Standard lift, 15-inch radius, 3-inch track",
      "high_lift_in": null,
      "headroom_in": 18,
      "floor_to_obstruction_in": 186,
      "floor_to_obstruction_ft_in": "15 ft 6 in",
      "backroom_in": null,
      "arithmetic": "C=168+18=186",
      "source_formula": "H=18",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-HL48-168",
      "door_height_in": 168,
      "opening_height_in": 168,
      "configuration": "High lift, 48 inches, 2-inch track",
      "high_lift_in": 48,
      "headroom_in": 60,
      "floor_to_obstruction_in": 228,
      "floor_to_obstruction_ft_in": "19 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=168+60=228",
      "source_formula": "H=48+12",
      "source_id": "S02;S08",
      "source_url": "https://cdn.clopay.com/public/High_Lift.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-HLCE-168",
      "door_height_in": 168,
      "opening_height_in": 168,
      "configuration": "Hypothetical high lift at L=D — excluded by T-5",
      "high_lift_in": 168,
      "headroom_in": 180,
      "floor_to_obstruction_in": 348,
      "floor_to_obstruction_ft_in": "29 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=168+180=348",
      "source_formula": "H=D+12",
      "source_id": "S01;S08",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "algebra_only_outside_T5_limit",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-VB-168",
      "door_height_in": 168,
      "opening_height_in": 168,
      "configuration": "Vertical lift, T-7 breakaway",
      "high_lift_in": null,
      "headroom_in": 180,
      "floor_to_obstruction_in": 348,
      "floor_to_obstruction_ft_in": "29 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=168+180=348",
      "source_formula": "H=D+12",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-VSI-168",
      "door_height_in": 168,
      "opening_height_in": 168,
      "configuration": "Vertical lift, T-7 straight incline",
      "high_lift_in": null,
      "headroom_in": null,
      "floor_to_obstruction_in": null,
      "floor_to_obstruction_ft_in": null,
      "backroom_in": null,
      "arithmetic": "No output: D exceeds T-7 straight-incline limit of 120 inches",
      "source_formula": "H=D+24 for D<=120 only",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "excluded_above_T7_straight_incline_height_limit",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "CE-192",
      "door_height_in": 192,
      "opening_height_in": 192,
      "configuration": "Algebraic crossover test — excluded by T-5 breakaway limits",
      "high_lift_in": 192,
      "headroom_in": 204,
      "floor_to_obstruction_in": 396,
      "floor_to_obstruction_ft_in": "33 ft 0 in",
      "backroom_in": 23,
      "arithmetic": "H_high=192+12=204; H_vertical=192+12=204; B_T10_2in=192-192+23=23; B_manual_vertical_2in=23",
      "source_formula": "H_high=L+12; H_vertical=D+12; B_high_2=O-L+23; B_vertical_2=23",
      "source_id": "S01;S02;S08",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf;https://cdn.clopay.com/public/High_Lift.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "algebra_only_outside_T5_limit",
      "notes": "The high-lift and vertical backroom expressions come from different documents; T-11 gives 25 inches. All L=D rows exceed T-5 breakaway D-24; 168 and 192 also exceed T-10 162-inch cap.",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "LM-192",
      "door_height_in": 192,
      "opening_height_in": 192,
      "configuration": "T-5 breakaway ceiling-independent lift upper bound",
      "high_lift_in": 162,
      "headroom_in": 174,
      "floor_to_obstruction_in": 366,
      "floor_to_obstruction_ft_in": "30 ft 6 in",
      "backroom_in": null,
      "arithmetic": "L_bound=min(192-24,162)=162; H_high=162+12=174; H_vertical=192+12=204; difference=204-174=30",
      "source_formula": "L_bound=min(D-24,162); H_high=L_bound+12; H_vertical=D+12",
      "source_id": "S08;S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-5B.pdf;https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "Ceiling-independent upper bound, not an orderable maximum. Available building height and all other drawing conditions can reduce the lift further.",
      "verified_on": "2026-09-16",
      "vertical_comparison_headroom_in": 204,
      "headroom_difference_in": 30
    },
    {
      "example_id": "FC-ST-192",
      "door_height_in": 192,
      "opening_height_in": 192,
      "configuration": "Standard lift, 15-inch radius, 3-inch track",
      "high_lift_in": null,
      "headroom_in": 18,
      "floor_to_obstruction_in": 210,
      "floor_to_obstruction_ft_in": "17 ft 6 in",
      "backroom_in": null,
      "arithmetic": "C=192+18=210",
      "source_formula": "H=18",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-HL48-192",
      "door_height_in": 192,
      "opening_height_in": 192,
      "configuration": "High lift, 48 inches, 2-inch track",
      "high_lift_in": 48,
      "headroom_in": 60,
      "floor_to_obstruction_in": 252,
      "floor_to_obstruction_ft_in": "21 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=192+60=252",
      "source_formula": "H=48+12",
      "source_id": "S02;S08",
      "source_url": "https://cdn.clopay.com/public/High_Lift.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-HLCE-192",
      "door_height_in": 192,
      "opening_height_in": 192,
      "configuration": "Hypothetical high lift at L=D — excluded by T-5",
      "high_lift_in": 192,
      "headroom_in": 204,
      "floor_to_obstruction_in": 396,
      "floor_to_obstruction_ft_in": "33 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=192+204=396",
      "source_formula": "H=D+12",
      "source_id": "S01;S08",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "algebra_only_outside_T5_limit",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-VB-192",
      "door_height_in": 192,
      "opening_height_in": 192,
      "configuration": "Vertical lift, T-7 breakaway",
      "high_lift_in": null,
      "headroom_in": 204,
      "floor_to_obstruction_in": 396,
      "floor_to_obstruction_ft_in": "33 ft 0 in",
      "backroom_in": null,
      "arithmetic": "C=192+204=396",
      "source_formula": "H=D+12",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "FC-VSI-192",
      "door_height_in": 192,
      "opening_height_in": 192,
      "configuration": "Vertical lift, T-7 straight incline",
      "high_lift_in": null,
      "headroom_in": null,
      "floor_to_obstruction_in": null,
      "floor_to_obstruction_ft_in": null,
      "backroom_in": null,
      "arithmetic": "No output: D exceeds T-7 straight-incline limit of 120 inches",
      "source_formula": "H=D+24 for D<=120 only",
      "source_id": "S07",
      "source_url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "excluded_above_T7_straight_incline_height_limit",
      "notes": "",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "AM-RIVL-120",
      "door_height_in": 120,
      "opening_height_in": 120,
      "configuration": "Amarr Rapid Install Vertical Lift example",
      "high_lift_in": null,
      "headroom_in": 133,
      "floor_to_obstruction_in": 253,
      "floor_to_obstruction_ft_in": "21 ft 1 in",
      "backroom_in": null,
      "arithmetic": "H=120+13=133; C=120+133=253",
      "source_formula": "H=D+13; C=O+H",
      "source_id": "S09",
      "source_url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "Example assumes an 8-foot-wide door, inside the stated 9-foot-4-inch width ceiling; other configuration requirements still apply.",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "HLH-24",
      "door_height_in": 120,
      "opening_height_in": 120,
      "configuration": "Illustration of manual L+12 headroom expression",
      "high_lift_in": 24,
      "headroom_in": 36,
      "floor_to_obstruction_in": 156,
      "floor_to_obstruction_ft_in": "13 ft 0 in",
      "backroom_in": null,
      "arithmetic": "H=24+12=36",
      "source_formula": "H=L+12",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "Algebraic headroom example only; does not assert an operator is available at L=24.",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "HLH-96",
      "door_height_in": 120,
      "opening_height_in": 120,
      "configuration": "Illustration of manual L+12 headroom expression",
      "high_lift_in": 96,
      "headroom_in": 108,
      "floor_to_obstruction_in": 228,
      "floor_to_obstruction_ft_in": "19 ft 0 in",
      "backroom_in": null,
      "arithmetic": "H=96+12=108",
      "source_formula": "H=L+12",
      "source_id": "S01",
      "source_url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "Algebraic headroom example only; does not assert an operator is available at L=24.",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "BR-T10-120-48",
      "door_height_in": 120,
      "opening_height_in": 120,
      "configuration": "T-10 high-lift backroom example, 2-inch track",
      "high_lift_in": 48,
      "headroom_in": 60,
      "floor_to_obstruction_in": 180,
      "floor_to_obstruction_ft_in": "15 ft 0 in",
      "backroom_in": 95,
      "arithmetic": "B=120-48+23=95; minus manual vertical 23 gives 72; minus T-11 vertical 25 gives 70",
      "source_formula": "B=O-L+23",
      "source_id": "S02;S01;S03",
      "source_url": "https://cdn.clopay.com/public/High_Lift.pdf;https://cdn.clopay.com/public/documents/0130006_rev12.pdf;https://cdn.clopay.com/public/Vertical.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "conditional_arithmetic_not_fit_check",
      "notes": "Difference depends on which vertical-lift document is used; 72 inches is 6 feet, 70 inches is 5 feet 10 inches.",
      "verified_on": "2026-09-16"
    },
    {
      "example_id": "CE3-120",
      "door_height_in": 120,
      "opening_height_in": 120,
      "configuration": "T-10/T-11 3-inch algebraic crossover",
      "high_lift_in": 119,
      "headroom_in": 132,
      "floor_to_obstruction_in": 252,
      "floor_to_obstruction_ft_in": "21 ft 0 in",
      "backroom_in": 26,
      "arithmetic": "L+13=D+12 => L=120-1=119; H=119+13=132; B_T10=120-119+25=26",
      "source_formula": "H_high=L+13; H_vertical=D+12; B_high=O-L+25",
      "source_id": "S02;S03;S08",
      "source_url": "https://cdn.clopay.com/public/High_Lift.pdf;https://cdn.clopay.com/public/Vertical.pdf;https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "assumptions": "O=D; inches; baseline only; no operator, double-shaft, additional spring, structural or building-services allowances; no physical test or product approval.",
      "status": "algebra_only_outside_T5_limit",
      "notes": "Headroom equality does not produce backroom equality: T-11 backroom is 25 inches. No physical configuration approval.",
      "verified_on": "2026-09-16"
    }
  ],
  "source_conflicts": [
    {
      "conflict_id": "D1",
      "topic": "High-lift base allowances",
      "source_a": "S04",
      "value_a": "Residential guide: L+at least 9.5",
      "source_b": "S01;S02;S08",
      "value_b": "Manual: L+12 both sizes; T-10: L+12 / L+13; T-5: L+12",
      "difference": null,
      "treatment": "Retain document identities and scope. No assertion that an undocumented reason resolves the differences.",
      "reviewed_on": "2026-09-16"
    },
    {
      "conflict_id": "D2",
      "topic": "Vertical-lift backroom",
      "source_a": "S01",
      "value_a": "23 inches (2-inch track), 25 inches (3-inch track)",
      "source_b": "S03",
      "value_b": "25 inches both track sizes",
      "difference": 2,
      "treatment": "Use only document-specific values; do not declare either document superseded.",
      "reviewed_on": "2026-09-16"
    },
    {
      "conflict_id": "D3",
      "topic": "Cross-manufacturer vertical-lift headroom",
      "source_a": "S01;S03;S07",
      "value_a": "Clopay baseline/breakaway: D+12",
      "source_b": "S09",
      "value_b": "Rapid Install Vertical Lift: D+13; generic table malformed as Door Height = +13",
      "difference": 1,
      "treatment": "Comparison uses Rapid Install only, within its stated scope; not an average or a correction of the generic table.",
      "reviewed_on": "2026-09-16"
    },
    {
      "conflict_id": "D4",
      "topic": "Amarr high-lift measurement reference",
      "source_a": "S09",
      "value_a": "12.5 / 13.5 inches printed under Headroom Required",
      "source_b": "S09",
      "value_b": "No complete L-based equation stated",
      "difference": null,
      "treatment": "Excluded from calculations; no invented equation.",
      "reviewed_on": "2026-09-16"
    },
    {
      "conflict_id": "D5",
      "topic": "High-lift limits versus factory-consultation triggers",
      "source_a": "S02;S08",
      "value_a": "T-10: 162-inch maximum. T-5 breakaway: min(D-24,162) plus available-height limit",
      "source_b": "S10",
      "value_b": "Model 3241: consultation above 120-inch lift or 300-square-foot opening",
      "difference": null,
      "treatment": "Hard dimensional limits and consultation triggers are different data types; neither proves orderability at L=D.",
      "reviewed_on": "2026-09-16"
    },
    {
      "conflict_id": "D6",
      "topic": "High-lift measurement datum",
      "source_a": "S11",
      "value_a": "Header to underside of horizontal track",
      "source_b": "S20",
      "value_b": "Top of closed door to horizontal-track centerline",
      "difference": null,
      "treatment": "Preserve both reference points; no fixed or radius-sized correction inferred.",
      "reviewed_on": "2026-09-16"
    },
    {
      "conflict_id": "D7",
      "topic": "DASMA document identity",
      "source_a": "S14;S19",
      "value_a": "TDS 161 concerns connecting door jambs to framing",
      "source_b": "S11;S15",
      "value_b": "TDS 160 is terminology; ANSI/DASMA 102-2018 addresses sectional-door specifications",
      "difference": null,
      "treatment": "Do not cite TDS 161 as a headroom chart or claim that no dimensional standard exists anywhere.",
      "reviewed_on": "2026-09-16"
    },
    {
      "conflict_id": "D8",
      "topic": "High-lift backroom drawings",
      "source_a": "S02",
      "value_a": "O-L+23 / O-L+25",
      "source_b": "S08",
      "value_b": "D-L+35 / D-L+38",
      "difference": "12 inches on 2-inch track; 13 inches on 3-inch track when O=D",
      "treatment": "Different variables and constants retained. If O=D, differences are 12 and 13 inches; no harmonization.",
      "reviewed_on": "2026-09-16"
    },
    {
      "conflict_id": "D9",
      "topic": "High-lift operator language",
      "source_a": "S02",
      "value_a": "Only jackshaft motor operators available for this track",
      "source_b": "S08",
      "value_b": "Trolley operator adds 4 inches headroom; operator block is scoped to lift greater than 24 inches",
      "difference": null,
      "treatment": "Do not generalize either into universal trolley approval or a universal ban.",
      "reviewed_on": "2026-09-16"
    },
    {
      "conflict_id": "D10",
      "topic": "Follow-the-roof headroom labels",
      "source_a": "S06",
      "value_a": "Diagram: 16 / 18 inches above opening",
      "source_b": "S06",
      "value_b": "Table: Door Ht+16 / Door Ht+18 under Headroom",
      "difference": null,
      "treatment": "Exclude from normalized headroom calculations; publish the label discrepancy.",
      "reviewed_on": "2026-09-16"
    },
    {
      "conflict_id": "D11",
      "topic": "Low-headroom rear operator allowance",
      "source_a": "S05",
      "value_a": "Prose: trolley adds 4 inches backroom",
      "source_b": "S05",
      "value_b": "Table: trolley operator Headroom+4",
      "difference": null,
      "treatment": "Keep both labels visible; obtain the applicable drawing rather than guessing the intended axis.",
      "reviewed_on": "2026-09-16"
    },
    {
      "conflict_id": "D12",
      "topic": "Low-headroom rear 2-inch track baseline",
      "source_a": "S01",
      "value_a": "Manual: 6.5 inches headroom",
      "source_b": "S05",
      "value_b": "Drawing: Clopay 4.5 inches; Ideal Door 6.5 inches",
      "difference": null,
      "treatment": "Keep source and brand labels; not a universal replacement of the manual figure.",
      "reviewed_on": "2026-09-16"
    }
  ],
  "sources": [
    {
      "source_id": "S01",
      "organization": "Clopay",
      "title": "Installation & Maintenance — Commercial & Industrial Sectional Doors, P/N 0130006",
      "url": "https://cdn.clopay.com/public/documents/0130006_rev12.pdf",
      "document_revision": "06/12",
      "location": "Printed pp. 4–5, 8, 15, 17, 27–28, 32",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Clearance table is explicitly approximate. This is the June 2012 document, not a representation of a newly issued manual."
    },
    {
      "source_id": "S02",
      "organization": "Clopay",
      "title": "High-Lift Track, T-10",
      "url": "https://cdn.clopay.com/public/High_Lift.pdf",
      "document_revision": "Undated",
      "location": "One-page dimensional sheet",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Opening + High-Lift Height labels a track-level dimension, not the entire obstruction envelope."
    },
    {
      "source_id": "S03",
      "organization": "Clopay",
      "title": "Vertical-Lift Track, T-11",
      "url": "https://cdn.clopay.com/public/Vertical.pdf",
      "document_revision": "Undated",
      "location": "One-page dimensional sheet",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": ""
    },
    {
      "source_id": "S04",
      "organization": "Clopay",
      "title": "Residential Garage Door Track Options",
      "url": "https://www.clopaydoor.com/buyingguide/garage-door-track-options",
      "document_revision": "Undated",
      "location": "High Lift section",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Residential-facing guide; no reconciliation with commercial allowances asserted."
    },
    {
      "source_id": "S05",
      "organization": "Clopay",
      "title": "Low Headroom Track (Rear Mount Springs), T-9",
      "url": "https://cdn.clopay.com/public/Low_Headroom_Rear.pdf",
      "document_revision": "Undated",
      "location": "One-page dimensional sheet",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "The prose and operator table label the 4-inch allowance differently; retained as an unresolved source-label discrepancy."
    },
    {
      "source_id": "S06",
      "organization": "Clopay",
      "title": "Follow-the-Roof Track, T-12",
      "url": "https://cdn.clopay.com/public/follow_the_roof.pdf",
      "document_revision": "Undated",
      "location": "One-page dimensional sheet",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Diagram headroom labels and table headroom expressions differ; excluded from comparative arithmetic."
    },
    {
      "source_id": "S07",
      "organization": "Clopay",
      "title": "Vertical-Lift Track, sheet T-7; file T-7B.pdf",
      "url": "https://cdn.clopay.com/public/Documents/T-7B.pdf",
      "document_revision": "REV. DEC, 2025",
      "location": "One-page drawing; headroom block and straight-incline checkbox",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Image-only PDF was read visually; the straight-incline option is limited to 10-foot door height."
    },
    {
      "source_id": "S08",
      "organization": "Clopay",
      "title": "High-Lift Track, sheet T-5; file T-5B.pdf",
      "url": "https://cdn.clopay.com/public/Documents/T-5B.pdf",
      "document_revision": "Undated",
      "location": "One-page drawing; Maximum Available Hi-Lift block, headroom block, backroom dimension",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Breakaway high lift must not exceed D−24 inches or 162 inches; available floor-to-ceiling height supplies an additional bound. Straight-incline high lift has its own limit table."
    },
    {
      "source_id": "S09",
      "organization": "Amarr",
      "title": "Lift Options for Commercial Garage Doors",
      "url": "https://www.amarr.com/us/en/commercial-doors/understand-commercial-doors/lift-options",
      "document_revision": "Undated",
      "location": "Seven lift-option tables",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Generic Vertical Lift table prints Door Height = +13; only the unambiguous Rapid Install Vertical Lift D+13 formula is normalized for calculation."
    },
    {
      "source_id": "S10",
      "organization": "C.H.I. Overhead Doors",
      "title": "Model 3241 three-part specification, Section 08 36 00 / 08360",
      "url": "https://www.chiohd.com/hubfs/3%20part%20spec%20pdf/20240628-01_CHI_Specification_3P_08360_3241.pdf",
      "document_revision": "2024-06-28 date encoded in filename; not asserted to be a printed revision",
      "location": "Printed pp. 1 and 7",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Factory-consultation thresholds are not maximum product sizes and are specific to this model specification."
    },
    {
      "source_id": "S11",
      "organization": "DASMA",
      "title": "Technical Data Sheet 160 — Sectional Garage Door Terminology",
      "url": "https://www.dasma.com/wp-content/uploads/2020/06/TDS160-Sectional-Garage-Door-Terminology.pdf",
      "document_revision": "Rev. 8/17; Reaffirmed 6/18; Rev. 1/19",
      "location": "Relevant alphabetical entries and introductory scope",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "The document expressly says it is not a standard-type document."
    },
    {
      "source_id": "S12",
      "organization": "DASMA",
      "title": "Technical Data Sheet 182 — Technical Considerations for Dock Doors",
      "url": "https://www.dasma.com/wp-content/uploads/pubs/TechDataSheets/CommercialResidential/TDS182.pdf",
      "document_revision": "12/13; Rev. 7/16; Rev. 11/16; Reaff. 3/20",
      "location": "Printed pp. 2–4",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Typical size range is not a market-share or modal-door-size measurement."
    },
    {
      "source_id": "S13",
      "organization": "DASMA",
      "title": "Technical Data Sheet 1501 — Standard Lift Garage Doors with Jackshaft Operation",
      "url": "https://www.dasma.com/wp-content/uploads/2022/12/TDS1501.pdf",
      "document_revision": "12/08/22",
      "location": "Printed pp. 1–3",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": ""
    },
    {
      "source_id": "S14",
      "organization": "DASMA",
      "title": "Technical Data Sheets index",
      "url": "https://www.dasma.com/technical-data-sheets/",
      "document_revision": "Live index",
      "location": "Entries 160, 161 and 1501",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Used to verify document identity, not to prove that no headroom standard exists anywhere."
    },
    {
      "source_id": "S15",
      "organization": "DASMA",
      "title": "ANSI/DASMA 102-2018 — Specifications for Sectional Doors",
      "url": "https://www.dasma.com/wp-content/uploads/2021/01/ANSIDASMA102.pdf",
      "document_revision": "2018 edition shown on document cover",
      "location": "Sections 4, 8.1, 8.2.1–8.2.2, 10.1",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "The PDF search title is stale; the edition is taken from the cover."
    },
    {
      "source_id": "S16",
      "organization": "USACE / NAVFAC / AFCEC",
      "title": "UFGS 08 36 13 — Sectional Overhead Doors",
      "url": "https://www.wbdg.org/FFC/DOD/UFGS/UFGS%2008%2036%2013.pdf",
      "document_revision": "August 2020 section; current file references UMRL July 2026",
      "location": "Printed pp. 3 and 8; section 2.1.1",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Editable project guide specification, not universal manufacturer minimum headroom."
    },
    {
      "source_id": "S17",
      "organization": "City of Rockford, Illinois",
      "title": "Permits",
      "url": "https://rockfordil.gov/438/Permits",
      "document_revision": "Live page",
      "location": "Permit scope and links",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": ""
    },
    {
      "source_id": "S18",
      "organization": "Winnebago County, Illinois",
      "title": "Building Division",
      "url": "https://wincoil.gov/departments/community-development/building-division",
      "document_revision": "Live page",
      "location": "Listed service jurisdictions",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": ""
    },
    {
      "source_id": "S19",
      "organization": "DASMA",
      "title": "Technical Data Sheet 161 — Connecting Garage Door Jambs to Building Framing",
      "url": "https://www.dasma.com/wp-content/uploads/2024/05/TDS-161.pdf",
      "document_revision": "Printed revision not used; publisher URL is under 2024/05",
      "location": "Document title and scope",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Not a document titled Headroom Requirements."
    },
    {
      "source_id": "S20",
      "organization": "DDM Garage Doors",
      "title": "High Lift — How High Can I Go?",
      "url": "https://shop.ddmgaragedoors.com/pages/high-lift-how-high-can-i-go-ddm-garage-doors",
      "document_revision": "Undated",
      "location": "Opening definition only",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Cited only as the primary source of this supplier’s measurement definition; its adjustment procedures are not reproduced."
    },
    {
      "source_id": "S21",
      "organization": "City of Rockford, Illinois",
      "title": "Construction & Development Services FAQ — building-permit exemptions",
      "url": "https://rockfordil.gov/m/faq?cat=17",
      "document_revision": "Live page",
      "location": "Question: What type of work is exempt from a building permit?",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Door/window replacement exemption requires unchanged size and no required fire rating; no determination made for a track conversion."
    },
    {
      "source_id": "S22",
      "organization": "Illinois Capital Development Board",
      "title": "Illinois Codes FAQ",
      "url": "https://cdb.illinois.gov/business/codes/illinois-codes-faq.html",
      "document_revision": "Live page",
      "location": "Municipal County Reporting Questions; General Questions",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Explains January 1, 2025 baseline requirements and distinguishes adopting-code jurisdictions from non-building-code jurisdictions."
    },
    {
      "source_id": "S23",
      "organization": "Wayne Dalton",
      "title": "Sectional Doors — Models 216 and 220",
      "url": "https://www.wayne-dalton.com/commercial/detail/sectional-door-model-216-and-220",
      "document_revision": "Live page",
      "location": "Impact Panel Option",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Qualitative scope check only; no track-by-track breakaway availability matrix or clearance inputs drawn from this page."
    },
    {
      "source_id": "S24",
      "organization": "Clopay",
      "title": "Tracks and Springs — commercial technical library",
      "url": "https://www.clopaydoor.com/commercial-support-center/technical-library-commercial-builder/tracks-springs-commercial",
      "document_revision": "Live page",
      "location": "Track Types; Track Drawings and Specifications",
      "verified_on": "2026-09-16",
      "verification_method": "Primary publisher document/page read directly; dimensional PDF tables and drawings visually inspected where used",
      "note": "Primary directory used to follow and verify the T-5B and T-7B drawing links."
    }
  ]
}