Smoke Filling Time Calculator

Calculate the time for smoke to fill an enclosed space based on room geometry and fire heat release rate

Input Parameters

Results

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Smoke Fill Time
seconds
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Smoke Fill Time
minutes
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Smoke Volume at Target
m3
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Avg Smoke Layer Temp Rise
C
Note: This is a simplified zone model calculation. Actual smoke filling depends on room geometry, ventilation openings, and fire growth rate. For design purposes, use computer models like CFAST or FDS per NFPA 92.

Reference

NFPA 92/204 Smoke Filling: m_dot = 0.071 * Qc^(1/3) * z^(5/3) + 0.0018 * Qc Smoke Volume = Floor Area x Smoke Depth Fill Time ~ Smoke Volume / Volumetric Plume Flow Qc = 0.7 * Q (convective HRR)