Atrium Smoke Exhaust Calculator

Calculate atrium smoke exhaust rate per NFPA 92 based on fire size, atrium height, and plume characteristics

Input Parameters

Results

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Exhaust Rate
m3/s
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Exhaust Rate
CFM
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Plume Centerline Temp Rise
C
Note: Based on NFPA 92 Standard for Smoke Control Systems. Axisymmetric plume assumes fire is not against a wall. For wall or corner fires, use balcony spill plume or window plume equations instead.

Reference

NFPA 92 Axisymmetric Plume: m_dot = 0.071 * Qc^(1/3) * z^(5/3) + 0.0018 * Qc Qc = 0.7 * Q (convective fraction) deltaT = Qc / (m_dot * Cp) V_dot = m_dot / rho_smoke rho = 353 / T_smoke(K)