Nfpa 252 standard methods of fire tests of door assemblies in the late 1990s the required test method changed from neutral or negative pressure to positive pressure to more accurately simulate the conditions of a fire in the real world. This edition of nfpa 252 was approved as an american national standard on july 18 2003. Evaluate the ability of fire doors to resist the passage of flame heat and gases with the latest testing provisions in the new nfpa 252.
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