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What is the equation for transport time of smoke as related to ceiling height?

Question asked by mjkfire2000 on Dec 9, 2019
Latest reply on Dec 12, 2019 by mlaurence

I have been looking through the appendix B of NFPA 72 and I cannot find an equation where I can get the transport time of smoke as a correlated to the ceiling height. For example, I am trying to find the time it would take smoke to reach the top of a coffer (23ft) and then spill over into the next coffer. The top of the koffer is 23ft and the bottom of the coffer is 13ft. 

 

Any relevant equation that has the transport time and ceiling height will be helpful. 

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