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pair of fire doors

Question asked by jsworks on Apr 20, 2018
Latest reply on Apr 22, 2018 by cdafd

I'm inquiring about a condition w/ a pair of 90 min rated drs. There is a 1/2"+ gap between the meeting stiles, but there is a neoprene smoke stop that closes the gap. Does this smoke stop preserve the fire rating of the dr & frame assembly? Or is there other accessories that need to be attached? Ref NFPA 80 or NFPA 105

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