Doors containing fire resistance rated glazing materials fabricated and tested as door assemblies in accordance with nfpa 252 standard methods of fire tests of door assemblies to determine a fire protection rating should be regulated by this standard as a fire door assembly and not as a glazing material permitted in fire door assemblies as. 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.
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