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fire-resistance rating

   Also found in: Wikipedia 0.01 sec.
fire-resistance rating
The time in hours that a material or construction can withstand fire exposure, as determined in conformity with generally accepted standards, or from information derived from standard tests.


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Fire door assemblies required to have a minimum fire protection rating of 20 minutes where located in corridor walls or smoke barrier walls having a fire-resistance rating in accordance with Table 715.
42, requires a threehour fire-resistance rating, although an exception permits a one-hour fire-resistive enclosure where the transformer is protected with a fixed extinguishing system, such as sprinklers, or a gaseous agent extinguishing system.
Acceptable roofing material ranges from Class A fire-resistance rating, which provides the greatest protection, to Class C, which indicates the roof can withstand light exposure to fire.
 
 
 
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