Standard methods of fire tests of door assemblies outlines methods of fire testing door assemblies that testing laboratories and manufacturers can use to determine assembly suitability when fire. 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. D which indicates that the glazing is to be used in fire door assemblies and that the glazing meets the fire protection requirements of nfpa 252.
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