why does 2 hour rated wall assembly has only 1.5 hour rated doors?
This is my understanding from the fire door industry. The door carries a rating less than that of the wall because it is assumed there will be no fuel-load (furniture, fixtures, storage) in front of the door. NFPA 80 stipulates that unused doors be removed and the opening filled with wall construction equivalent to the rated wall.
Below is NFPA 101 explanation of this issue.
Thank you for the clarification.
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