Smoke Control Design: door_leakage
Smoke control design parameters per NFPA 92-2021 and IBC 2021 Section 909 — stairwell and elevator pressurization differentials (0.05–0.10 in. w.g.), door opening force limits (30 lbf max), atrium exhaust prescriptive rates (4–6 ACH), axisymmetric and balcony/window plume mass flow equations (NFPA 92 Eq. 4.1, 4.10, 4.12), design fire heat release rates by occupancy (1000–5000 kW), building leakage areas by tightness class (tight/average/loose), door leakage areas, t² fire growth coefficients, tenability criteria (visibility 16–33 ft, temperature 120°C max, CO FED thresholds), and the smoke filling rate formula. Sources: NFPA 92-2021, IBC 2021 Sec. 909, ASHRAE Handbook HVAC Applications Ch. 54, Klote/Milke Handbook of Smoke Control Engineering.
| smoke control type | record id | description | notes | unit | value typical |
|---|---|---|---|---|---|
| door_leakage | single_door_closed_gap | Single Door Closed — Effective Leakage Area | Approximate effective leakage area per door (gap around perimeter); ungasketed hollow metal door; used in stairwell pressurization fan sizing calculations; gasketed doors 0.02-0.05 ft² | ft2_per_door | 0.1 |
| door_leakage | single_door_gasketed | Single Door Closed Gasketed — Effective Leakage Area | Intumescent or brush gasketed door; significantly reduces leakage area; preferred for stairwell pressurization systems | ft2_per_door | 0.04 |
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