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Does a 1 hour fire resistant door really only last 20 minutes before it burns up in fire?

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Wiki User
March 20, 2007 1:44AM

No. A fire resistance rating is determined by the amount of time

a partition will prevent the spread of fire, so a one-hour door

(and its wall and supports) would have to hold back a typical fire

growing for at least one hour. For example, a 20-minute fire rating

requires a fire door to withstand an intense fire on one side,

rising to over 1,400 degrees F during twenty minutes, and then

being hit by a pressurized fire stream, without causing any

openings.


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