Smoke Control Design: tenability_co
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 |
|---|---|---|---|---|---|
| tenability_co | co_10min_incapacitation | Tenability — CO — FED=0.3 (Incapacitation) at 10 Minutes | CO concentration giving fractional effective dose (FED) = 0.3 at 10-min exposure; 0.3 FED = incapacitation threshold; design goal is to keep occupants below FED = 0.3 during egress time | ppm | 420 |
| tenability_co | co_30min_incapacitation | Tenability — CO — FED=0.3 (Incapacitation) at 30 Minutes | CO concentration giving FED = 0.3 at 30-min exposure; typical egress time for large atrium/complex buildings | ppm | 150 |
| tenability_co | co_iegress_path_limit | Tenability — CO — Practical Egress Path Design Limit | Conservative design limit for CO concentration in egress paths; OSHA 8-hr TWA = 50 ppm; NIOSH IDLH = 1200 ppm; practical life-safety egress path limit during 10-15 min egress | ppm | 200 |
This is a sample. Search the full smoke control design dataset and 300+ more by creating a free account and accessing the database.
Get started for FREE