Smoke Control Design: building_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 | formula or method | notes | unit | value max |
|---|---|---|---|---|---|---|
| building_leakage | average_construction | Building Leakage — Average Construction | Q = 2610 * A_L * sqrt(dP) | Effective leakage area for average construction; same 40000 ft² floor-plate reference; ratio 2.55/40000 = 6.375e-5 ft² per ft² floor area; most commercial office buildings | ft2_per_example_building | 2.55 |
| building_leakage | loose_construction | Building Leakage — Loose Construction | Q = 2610 * A_L * sqrt(dP) | Effective leakage area for loose construction; ratio 5.25/40000 = 1.3125e-4 ft² per ft² floor area; older buildings or poor construction | ft2_per_example_building | 5.25 |
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