“The one thing I cannot figure out is how it can pick up on carbon monoxide. They recommend mounting to the ceiling. Carbon monoxide is heavier than air, odorless ave colorless. Can it actually detect it?”
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They would be legally liable if it didn't do what it is advertised as doing, especially in a safety product. Most household CO detectors are ceiling mounted, so emitted CO will circulate in the space, despite being heavier, not so heavy it can't float in air for a long time. You can google the mechanism, which is a biomimetic color changing strip I believe, but rest assured it works as any other CO sensor works, and they are put through stringent testing to get approved.
Sorry, there was a problem. Please try again later.Google Nest Protect has been tested by Underwriters Laboratories to comply with US and Canadian safety standards as well as tested by UL UK to comply with British and European standards. Nest Protect uses different sensors to detect smoke and carbon monoxide (CO). Nest Protect detects carbon monoxide (CO), an odorless, colorless and potentially deadly gas. The CO sensor lasts up to 10 years. Learn more about 2nd generation Nest Protect sensors here: https://support.google.com/googlenest/answer/9251133
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