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. This edition of nfpa 252 was approved as an american national standard on july 18 2003. 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.
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