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Does a 1 hour fire resistant door really only last 20 minutes before it burns up in fire?
Wiki User
∙ 17y ago
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.
Wiki User
∙ 17y ago
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Are the scars on Leif Garret's face from burns and how did he get them?
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1
What age was Robert Burns before he died?
37
