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Re: FW: Fire ratings to UBC 1997

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I don't know that much about fires, but from what I do know, there are two
things that would make ventilation of a structure a good thing.  Yes,
would add oxygen to a fire, but (1) ventilation would help prevent the
of fumes and (2) ventilation would let some of the heat from the fire
and would help prevent flashover.  Flashover is when the space reaches a
critical temperature and basically everything in the space bursts into
My use of these terms is pretty loose, but a quick search on
gave me this site ( that has
more information on the proper definition of flashover, etc.

Somebody let me know if I am off base here!

Joe Fabregas

>you wrote:
>My specific question on parking garages was related to the post:
>"Please note that these liberal limits are in recognition of the very low
>fire hazard levels in open parking structures, mainly due to good
>ventilation. These rules do not apply to closed parking strucutres".
>I can't see how ventilation necessarily reduces the fire hazard.
>There is nominally no difference in the combustibility or fuel
>of an open versus a closed parking garage, if they are both built of the

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