Below is an installation of a smoke detector on a peaked ceiling. NFPA 72 says that such detector shall be installed within 36 inches of the peak of the ceiling.
18.104.22.168* Peaked. Detectors shall first he spaced and located within 36 in. (910 nnn) of the peak, me05lured horizontally, The number and spacing of additional detectors, if any, shall be based on the horizontal projection of the ceiling.
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