This edition of nfpa 252 was approved as an american national standard on july 18 2003. Fire resistance rated glazing in excess of 100 sq inches 0 065m2 shall be permitted in fire door assemblies when tested as components of the door assemblies and not as glass lights and shall have the maximum end temperature rise of 450 degrees f 250 degrees c in accordance with 716 5 5. 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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