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How far back is Fire Door Glazing Grand Fathered?

Question asked by Jeffrey Craig on Feb 13, 2018
Latest reply on Feb 13, 2018 by cda cda

I'm inspecting fire doors and some of the doors are very old and the glass does not have a label on it as it should according to NFPA 80. Is it necessary to label them or is there a grand father clause? and how would I find the fire rating on a non-labeled piece of glass?

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