Starting in 2011, carbon monoxide detectors became required by law in California (per SB183)
Each year in the US, unintentional carbon monoxide poisoning accounts for 15,000 emergency room visits and 500 deaths.
In view of that, this law makes sense.
For maximum effectiveness it matters where you install it.
I’ve met people who believe that because you instal smoke alarms on the ceiling you also install CO detectors on the ceiling.
Smoke is hot and heat rises.
Carbon monoxide has a specific gravity of 0.9, which means it is lighter than air, but only a little.
The best place to put one is near the point of combustion, and slightly higher. However not too near, as some devices emit a little CO when they are first started. The recommended distance is 15 feet from the point of combustion.
Carbon monoxide is most likely to kill you while you sleep, so putting one in each bedroom makes a lot of sense. Put it near the bed at about sleeping level, or slightly higher.
For a consumer reports type comparison of different CO detectors, select the link earlier in this sentence.
They’re easy to install as they are battery operated and do not require an electrical connection.
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