Difficulties with the principles and application of a zone model of flashover

Chow recently introduced computed results from the application of fire zone models to compartment fires. Taking a close look at Chow's work, the present study shows that there are several questions to be answered. In particular two equations, one for the energy balance and one for temperature, are highlighted. It is demonstrated that the two equations ought to be the same but are not because of the absence of the flow term in the former.