Datasets:

miadinside
/

combustion-air-and-confined-space-benchmark-2026

vector_id stringlengths 11 11	total_input_btu int64 25k 100k	room_len_ft int64 6 20	room_wid_ft int64 6 20	room_hgt_ft int64 8 8	room_vol_cuft int64 288 3.2k	req_unconfined_vol_cuft int64 1.25k 5k	is_confined_space bool 2 classes	vol_deficit_cuft int64 0 4.71k	louver_type stringclasses 3 values	indoor_2op_net_sqin int64 100 100	indoor_2op_gross_sqin int64 100 400	outdoor_vert_2op_net_sqin int64 10 25	outdoor_vert_2op_gross_sqin int64 10 100	outdoor_horiz_2op_net_sqin int64 13 50	outdoor_horiz_2op_gross_sqin int64 13 200	outdoor_single_net_sqin int64 10 33	outdoor_single_gross_sqin int64 10 132
CA-VEC-0001	25,000	6	6	8	288	1,250	true	962	metal	100	133	10	13	13	17	10	13
CA-VEC-0002	25,000	6	6	8	288	1,250	true	962	wood	100	400	10	40	13	52	10	40
CA-VEC-0003	25,000	6	6	8	288	1,250	true	962	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0004	25,000	6	8	8	384	1,250	true	866	metal	100	133	10	13	13	17	10	13
CA-VEC-0005	25,000	6	8	8	384	1,250	true	866	wood	100	400	10	40	13	52	10	40
CA-VEC-0006	25,000	6	8	8	384	1,250	true	866	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0007	25,000	6	10	8	480	1,250	true	770	metal	100	133	10	13	13	17	10	13
CA-VEC-0008	25,000	6	10	8	480	1,250	true	770	wood	100	400	10	40	13	52	10	40
CA-VEC-0009	25,000	6	10	8	480	1,250	true	770	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0010	25,000	6	12	8	576	1,250	true	674	metal	100	133	10	13	13	17	10	13
CA-VEC-0011	25,000	6	12	8	576	1,250	true	674	wood	100	400	10	40	13	52	10	40
CA-VEC-0012	25,000	6	12	8	576	1,250	true	674	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0013	25,000	6	15	8	720	1,250	true	530	metal	100	133	10	13	13	17	10	13
CA-VEC-0014	25,000	6	15	8	720	1,250	true	530	wood	100	400	10	40	13	52	10	40
CA-VEC-0015	25,000	6	15	8	720	1,250	true	530	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0016	25,000	6	20	8	960	1,250	true	290	metal	100	133	10	13	13	17	10	13
CA-VEC-0017	25,000	6	20	8	960	1,250	true	290	wood	100	400	10	40	13	52	10	40
CA-VEC-0018	25,000	6	20	8	960	1,250	true	290	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0019	25,000	8	6	8	384	1,250	true	866	metal	100	133	10	13	13	17	10	13
CA-VEC-0020	25,000	8	6	8	384	1,250	true	866	wood	100	400	10	40	13	52	10	40
CA-VEC-0021	25,000	8	6	8	384	1,250	true	866	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0022	25,000	8	8	8	512	1,250	true	738	metal	100	133	10	13	13	17	10	13
CA-VEC-0023	25,000	8	8	8	512	1,250	true	738	wood	100	400	10	40	13	52	10	40
CA-VEC-0024	25,000	8	8	8	512	1,250	true	738	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0025	25,000	8	10	8	640	1,250	true	610	metal	100	133	10	13	13	17	10	13
CA-VEC-0026	25,000	8	10	8	640	1,250	true	610	wood	100	400	10	40	13	52	10	40
CA-VEC-0027	25,000	8	10	8	640	1,250	true	610	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0028	25,000	8	12	8	768	1,250	true	482	metal	100	133	10	13	13	17	10	13
CA-VEC-0029	25,000	8	12	8	768	1,250	true	482	wood	100	400	10	40	13	52	10	40
CA-VEC-0030	25,000	8	12	8	768	1,250	true	482	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0031	25,000	8	15	8	960	1,250	true	290	metal	100	133	10	13	13	17	10	13
CA-VEC-0032	25,000	8	15	8	960	1,250	true	290	wood	100	400	10	40	13	52	10	40
CA-VEC-0033	25,000	8	15	8	960	1,250	true	290	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0034	25,000	8	20	8	1,280	1,250	false	0	metal	100	133	10	13	13	17	10	13
CA-VEC-0035	25,000	8	20	8	1,280	1,250	false	0	wood	100	400	10	40	13	52	10	40
CA-VEC-0036	25,000	8	20	8	1,280	1,250	false	0	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0037	25,000	10	6	8	480	1,250	true	770	metal	100	133	10	13	13	17	10	13
CA-VEC-0038	25,000	10	6	8	480	1,250	true	770	wood	100	400	10	40	13	52	10	40
CA-VEC-0039	25,000	10	6	8	480	1,250	true	770	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0040	25,000	10	8	8	640	1,250	true	610	metal	100	133	10	13	13	17	10	13
CA-VEC-0041	25,000	10	8	8	640	1,250	true	610	wood	100	400	10	40	13	52	10	40
CA-VEC-0042	25,000	10	8	8	640	1,250	true	610	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0043	25,000	10	10	8	800	1,250	true	450	metal	100	133	10	13	13	17	10	13
CA-VEC-0044	25,000	10	10	8	800	1,250	true	450	wood	100	400	10	40	13	52	10	40
CA-VEC-0045	25,000	10	10	8	800	1,250	true	450	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0046	25,000	10	12	8	960	1,250	true	290	metal	100	133	10	13	13	17	10	13
CA-VEC-0047	25,000	10	12	8	960	1,250	true	290	wood	100	400	10	40	13	52	10	40
CA-VEC-0048	25,000	10	12	8	960	1,250	true	290	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0049	25,000	10	15	8	1,200	1,250	true	50	metal	100	133	10	13	13	17	10	13
CA-VEC-0050	25,000	10	15	8	1,200	1,250	true	50	wood	100	400	10	40	13	52	10	40
CA-VEC-0051	25,000	10	15	8	1,200	1,250	true	50	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0052	25,000	10	20	8	1,600	1,250	false	0	metal	100	133	10	13	13	17	10	13
CA-VEC-0053	25,000	10	20	8	1,600	1,250	false	0	wood	100	400	10	40	13	52	10	40
CA-VEC-0054	25,000	10	20	8	1,600	1,250	false	0	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0055	25,000	12	6	8	576	1,250	true	674	metal	100	133	10	13	13	17	10	13
CA-VEC-0056	25,000	12	6	8	576	1,250	true	674	wood	100	400	10	40	13	52	10	40
CA-VEC-0057	25,000	12	6	8	576	1,250	true	674	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0058	25,000	12	8	8	768	1,250	true	482	metal	100	133	10	13	13	17	10	13
CA-VEC-0059	25,000	12	8	8	768	1,250	true	482	wood	100	400	10	40	13	52	10	40
CA-VEC-0060	25,000	12	8	8	768	1,250	true	482	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0061	25,000	12	10	8	960	1,250	true	290	metal	100	133	10	13	13	17	10	13
CA-VEC-0062	25,000	12	10	8	960	1,250	true	290	wood	100	400	10	40	13	52	10	40
CA-VEC-0063	25,000	12	10	8	960	1,250	true	290	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0064	25,000	12	12	8	1,152	1,250	true	98	metal	100	133	10	13	13	17	10	13
CA-VEC-0065	25,000	12	12	8	1,152	1,250	true	98	wood	100	400	10	40	13	52	10	40
CA-VEC-0066	25,000	12	12	8	1,152	1,250	true	98	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0067	25,000	12	15	8	1,440	1,250	false	0	metal	100	133	10	13	13	17	10	13
CA-VEC-0068	25,000	12	15	8	1,440	1,250	false	0	wood	100	400	10	40	13	52	10	40
CA-VEC-0069	25,000	12	15	8	1,440	1,250	false	0	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0070	25,000	12	20	8	1,920	1,250	false	0	metal	100	133	10	13	13	17	10	13
CA-VEC-0071	25,000	12	20	8	1,920	1,250	false	0	wood	100	400	10	40	13	52	10	40
CA-VEC-0072	25,000	12	20	8	1,920	1,250	false	0	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0073	25,000	15	6	8	720	1,250	true	530	metal	100	133	10	13	13	17	10	13
CA-VEC-0074	25,000	15	6	8	720	1,250	true	530	wood	100	400	10	40	13	52	10	40
CA-VEC-0075	25,000	15	6	8	720	1,250	true	530	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0076	25,000	15	8	8	960	1,250	true	290	metal	100	133	10	13	13	17	10	13
CA-VEC-0077	25,000	15	8	8	960	1,250	true	290	wood	100	400	10	40	13	52	10	40
CA-VEC-0078	25,000	15	8	8	960	1,250	true	290	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0079	25,000	15	10	8	1,200	1,250	true	50	metal	100	133	10	13	13	17	10	13
CA-VEC-0080	25,000	15	10	8	1,200	1,250	true	50	wood	100	400	10	40	13	52	10	40
CA-VEC-0081	25,000	15	10	8	1,200	1,250	true	50	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0082	25,000	15	12	8	1,440	1,250	false	0	metal	100	133	10	13	13	17	10	13
CA-VEC-0083	25,000	15	12	8	1,440	1,250	false	0	wood	100	400	10	40	13	52	10	40
CA-VEC-0084	25,000	15	12	8	1,440	1,250	false	0	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0085	25,000	15	15	8	1,800	1,250	false	0	metal	100	133	10	13	13	17	10	13
CA-VEC-0086	25,000	15	15	8	1,800	1,250	false	0	wood	100	400	10	40	13	52	10	40
CA-VEC-0087	25,000	15	15	8	1,800	1,250	false	0	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0088	25,000	15	20	8	2,400	1,250	false	0	metal	100	133	10	13	13	17	10	13
CA-VEC-0089	25,000	15	20	8	2,400	1,250	false	0	wood	100	400	10	40	13	52	10	40
CA-VEC-0090	25,000	15	20	8	2,400	1,250	false	0	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0091	25,000	20	6	8	960	1,250	true	290	metal	100	133	10	13	13	17	10	13
CA-VEC-0092	25,000	20	6	8	960	1,250	true	290	wood	100	400	10	40	13	52	10	40
CA-VEC-0093	25,000	20	6	8	960	1,250	true	290	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0094	25,000	20	8	8	1,280	1,250	false	0	metal	100	133	10	13	13	17	10	13
CA-VEC-0095	25,000	20	8	8	1,280	1,250	false	0	wood	100	400	10	40	13	52	10	40
CA-VEC-0096	25,000	20	8	8	1,280	1,250	false	0	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0097	25,000	20	10	8	1,600	1,250	false	0	metal	100	133	10	13	13	17	10	13
CA-VEC-0098	25,000	20	10	8	1,600	1,250	false	0	wood	100	400	10	40	13	52	10	40
CA-VEC-0099	25,000	20	10	8	1,600	1,250	false	0	direct_screen	100	100	10	10	13	13	10	10
CA-VEC-0100	25,000	20	12	8	1,920	1,250	false	0	metal	100	133	10	13	13	17	10	13

End of preview. Expand in Data Studio

Confined Space Combustion Air & Louver Sizing Benchmark Matrix (2026)

Benchmark Series — HVACLogic Open Building Science Initiative
Author: Miad Saadidi
Affiliation: HVACLogic Engineering & Building Science Working Group
Canonical Engine: https://hvaclogic.org/calculators/combustion-air-calculator
Methodology Documentation: https://hvaclogic.org/methodology
Companion Figshare DOI: https://doi.org/10.6084/m9.figshare.33753856
Governing Standards: NFPA 54 / ANSI Z223.1 & IFGC Chapter 3 (Section 304)

1. Physical Scope & Engineering Overview

In modern airtight residential envelopes (ACH50 <= 3.0), atmospheric gas appliances rapidly deplete indoor oxygen, creating dangerous negative pressures and carbon monoxide backdraft risks. This benchmark matrix provides 540 deterministic test vectors across appliance inputs (25k to 250k BTU/hr), room volumes, and required net/gross opening dimensions.

2. Benchmark Simulation Matrix (Sample Vectors)

Vector ID	Total Input (BTU/hr)	Room Dimensions (L x W x H)	Room Vol (cu ft)	Required Vol (cu ft)	Confined Space?	Deficit (cu ft)	Louver Type	Indoor 2-Op Gross (sq in)	Outdoor Vert Gross (sq in)	Outdoor Horiz Gross (sq in)	Single Op Gross (sq in)
`CA-VEC-0001`	25,000	6' x 6' x 8'	288	1,250	TRUE	962	Metal (75%)	133	13	17	11
`CA-VEC-0002`	25,000	6' x 6' x 8'	288	1,250	TRUE	962	Wood (25%)	400	40	52	32
`CA-VEC-0003`	25,000	6' x 6' x 8'	288	1,250	TRUE	962	Screen (100%)	100	10	13	8
`CA-VEC-0050`	60,000	8' x 10' x 8'	640	3,000	TRUE	2,360	Metal (75%)	133	20	40	27
`CA-VEC-0120`	100,000	10' x 12' x 8'	960	5,000	TRUE	4,040	Metal (75%)	133	33	67	44
`CA-VEC-0250`	150,000	12' x 15' x 8'	1,440	7,500	TRUE	6,060	Metal (75%)	200	50	100	67
`CA-VEC-0400`	200,000	15' x 20' x 8'	2,400	10,000	TRUE	7,600	Metal (75%)	267	67	133	89
`CA-VEC-0540`	250,000	20' x 20' x 8'	3,200	12,500	TRUE	9,300	Wood (25%)	1,000	252	500	332

3. Governing Formulations

3.1 Unconfined Space Volume (NFPA 54 / IFGC 304.5.1)

V_req = (Total Input BTU/hr / 1,000) * 50 cu ft

3.2 Engineered Opening Free Area

Indoor Communication (2 Openings): 1 sq in per 1,000 BTU/hr (min 100 sq in each)
Outdoor Vertical Ducts (2 Openings): 1 sq in per 4,000 BTU/hr
Outdoor Horizontal Ducts (2 Openings): 1 sq in per 2,000 BTU/hr
Single Direct Outdoor Opening: 1 sq in per 3,000 BTU/hr

3.3 Free Area Multipliers

Metal Louvers: 1.333x (75% free area)
Wood Louvers: 4.000x (25% free area)
Direct Wire Screen: 1.000x (100% free area)

4. Verification & Computational Reference

All calculations run client-side in pure TypeScript:
https://hvaclogic.org/calculators/combustion-air-calculator

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