In fact many of the test standards such as nfpa 252 nfpa 257 astm e 119 ul 263 etc. Origin and development of nfpa 252 standard methods of fire tests of door assemblies was adopted as a tentative standard by the astm in 1940 and was formally adopted in 1941. 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.
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