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 in fire resistive walls. 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. Fire protection rated glazing used in doors shall bear a four part identification in the form of d h or nh t or nt xxx with the component parts defined as follows.
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