What is the highest rating for a wood door?
Rated openings up to 90 min. can contain a properly constructed and labeled wood door. Beyond 90 min. (2HR, 3HR, etc.) a metal door is required.
Also: 90 min. is the highest rating where a KD (knock-down) metal frame can be used, beyond 90 min. the HM (hollow metal) frame must be welded.
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