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 standard prescribes standardized fire and hose stream test procedures that apply to fire door assemblies intended to be used to retard the spread of fire through door openings. 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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