Flashover Prediction Calculator

Predict flashover conditions using Thomas, MQH, and Babrauskas correlations for compartment fires.

Input Parameters

Results

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Thomas Flashover HRR
kW
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MQH Flashover HRR
kW
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Babrauskas Flashover HRR
kW
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Ventilation Factor
m^(5/2)
Note: Flashover typically occurs when the upper gas layer reaches ~500-600 deg C. These correlations are from the SFPE Handbook and NFPA 921. Results should be compared across methods for reliability.

Reference

Thomas: Q_fo = 7.8*A_T + 378*A_o*sqrt(H_o) [kW] MQH: Q_fo = 610*(h_k*A_T*A_o*sqrt(H_o))^0.5 [kW] Babrauskas: Q_fo = 750*A_o*sqrt(H_o) [kW] Ventilation Factor = A_o * sqrt(H_o) Where A_T = total surface area, A_o = opening area, H_o = opening height