Results
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Equivalent Fire Duration
min
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Opening Factor
m^(1/2)
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Est. Max Compartment Temp
degC
Note: This calculator uses Eurocode parametric fire curves and Law's equivalent fire severity method. Opening factor typically ranges from 0.02 to 0.20 m^(1/2). For typical office buildings, fuel load is 420-800 MJ/m². Results should be validated against ASTM E119 or ISO 834 test data.
Reference
Law's Equivalent Duration: te = ef * kb / O
Opening Factor: O = Av*sqrt(Hv)/At [Eurocode 1-1-2]
Parametric Max Temp: T = 20+1325*(1-0.324*e^(-0.2t*)-0.204*e^(-1.7t*)-0.472*e^(-19t*))
t* = ef/(1160*O)
Ref: Eurocode 1 Part 1-2 Annex A, CIB W14