Thread: CO Detectors
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Old 1/19/19, 3:59 PM
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Default Re: CO Detectors

CO is a little lighter than air so the alarm can go on the ceiling. The NFPA allows ceiling type alarms to be mounted there. The info in the video is incorrect.

Why carbon monoxide (CO) alarms don’t need to be installed near the floor

Carbon monoxide (CO) is slightly lighter than air, so carbon monoxide alarms are effective when placed on the ceiling or high up on a wall. You should install Nest Protect according to the guidelines in the User’s Guide that came with it.

There’s a myth that carbon monoxide alarms should be installed lower on the wall because carbon monoxide is heavier than air. In fact, carbon monoxide is slightly lighter than air and diffuses evenly throughout the room. According to the carbon monoxide guidelines of the National Fire Protection Association (NFPA 720, 2005 edition), all carbon monoxide alarms “shall be centrally located outside of each separate sleeping area in the immediate vicinity of the bedrooms,” and each alarm “shall be located on the wall, ceiling or other location as specified in the installation instructions that accompany the unit.”
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