How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
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How close can a smoke detector be to an air conditioning/heating supply register (vent)?
Friday, December 4, 2020
A smoke alarm should not be installed within three feet horizontally of a supply register, and outside the direct air flow from a register, according to the National Fire Protection Association [NFPA 72, 220.127.116.11(8), 2019 edition]. The forced-air flow from a register that is too close to a smoke detector will disturb the natural upward flow of smoke to the detector, and slow the its response time.
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