Can carbon monoxide (CO) be detected on the ceiling?

Yes. According to the CO guidelines of the National Fire Protection Association, carbon monoxide alarms should 'be centrally located outside of each separate sleeping area in the immediate vicinity of the bedrooms,' and each alarm should 'be located on the wall, ceiling or other location' according to the manufacturer's recommendations.

There's a common myth that carbon monoxide (CO) sensors are supposed to be placed at 'knee height' because CO is heavier than air. CO is actually slightly lighter than air and diffuses evenly through rooms. Besides, the source of carbon monoxide is usually warm, like a boiler. In this case the carbon monoxide containing air will be more likely to rise to higher areas of your home. Typical sensors are often plugged into wall outlets as a convenient power source, placing them close to the floor in rooms. 

Besides, we give you pre-warnings that show you visualizations of carbon monoxide levels, even if they're not yet an emergency.

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