Benchmark Matrix: Confined Space Combustion Air Infiltration, Opening Free Area, and Gross Louver Sizing Vectors per NFPA 54 and IFGC (540 Points)

Overview & Scope</p><p dir="ltr">This benchmark dataset compiles 540 deterministic engineering validation vectors modeling mechanical room confined space thresholds, appliance combustion air volume deficits, and required gross louver opening dimensions across standard indoor and outdoor ventilation methods.</p><p><br></p><p dir="ltr">The dataset systematically models interactions across:</p><p dir="ltr">- Gas appliance thermal inputs: 25,000 to 250,000 BTU/hr total firing rate (furnaces, water heaters, boilers).</p><p dir="ltr">- Mechanical room geometries: Enclosure floor plans from 6x6 ft to 20x20 ft with 8 ft ceiling heights (288 to 3,200 cu ft).</p><p dir="ltr">- Confined space criteria: National Fuel Gas Code standard baseline of 50 cu ft per 1,000 BTU/hr total appliance input.</p><p dir="ltr">- Ventilation methods: Indoor air via 2 permanent openings (1 sq in / 1,000 BTU, min 100 sq in each), outdoor air via vertical ducts (1 sq in / 4,000 BTU), outdoor air via horizontal ducts (1 sq in / 2,000 BTU), and single outdoor opening (1 sq in / 3,000 BTU).</p><p dir="ltr">- Louver material free-area deratings: Metal louvers (75% free area, 1.333x multiplier), Wood louvers/slats (25% free area, 4.00x multiplier), and Direct wire mesh screen (100% free area, 1.00x).</p><p><br></p><p dir="ltr">### 2.

Tabular Schema Dictionary</p><p dir="ltr">- `vector_id` (string): Unique sample identifier (`CA-VEC-0001` to `CA-VEC-0540`)</p><p dir="ltr">- `total_input_btu` (integer): Combined gas appliance input rating (BTU/hr)</p><p dir="ltr">- `room_len_ft` (integer): Mechanical room length (ft)</p><p dir="ltr">- `room_wid_ft` (integer): Mechanical room width (ft)</p><p dir="ltr">- `room_hgt_ft` (integer): Mechanical room ceiling height (ft)</p><p dir="ltr">- `room_vol_cuft` (integer): Total enclosed mechanical room volume (cu ft)</p><p dir="ltr">- `req_unconfined_vol_cuft` (float): Minimum volume for unconfined space rating per NFPA 54 (cu ft)</p><p dir="ltr">- `is_confined_space` (boolean): Flag indicating whether room is confined space (`TRUE` / `FALSE`)</p><p dir="ltr">- `vol_deficit_cuft` (float): Volume deficit requiring engineered combustion air openings (cu ft)</p><p dir="ltr">- `louver_type` (string): Material classification (`metal`, `wood`, `direct_screen`)</p><p dir="ltr">- `indoor_2op_net_sqin` (integer): Net free area per opening for indoor communication (sq in)</p><p dir="ltr">- `indoor_2op_gross_sqin` (integer): Gross louver area required for indoor communication (sq in)</p><p dir="ltr">- `outdoor_vert_2op_net_sqin` (integer): Net free area per opening for vertical outdoor ducts (sq in)</p><p dir="ltr">- `outdoor_vert_2op_gross_sqin` (integer): Gross louver area required for vertical outdoor ducts (sq in)</p><p dir="ltr">- `outdoor_horiz_2op_net_sqin` (integer): Net free area per opening for horizontal outdoor ducts (sq in)</p><p dir="ltr">- `outdoor_horiz_2op_gross_sqin` (integer): Gross louver area required for horizontal outdoor ducts (sq in)</p><p dir="ltr">- `outdoor_single_net_sqin` (integer): Net free area for single outdoor opening (sq in)</p><p dir="ltr">- `outdoor_single_gross_sqin` (integer): Gross louver area required for single outdoor opening (sq in)</p><p><br></p><p dir="ltr">### 3.