I've got a Carbon Monoxide (CO) detector (BRK CO250B, instruction sheet PDF) that I am looking to install in our house. All of the bedrooms are on the top level of our quad-level house, and I'm planning on installing it in the hallway.
The directions say that it can be either ceiling or wall mounted. I've looked around online, and I've seen various recommendations for what the ideal height is for the detector.
- Some say ceiling mounted is best, because CO is lighter than air. (Combination smoke/CO detectors all get mounted here.)
- Some say that a few feet below ceiling height is best, because a pocket of warm air may prevent the CO from getting all the way up to the level of the detector.
- Some say that "bed height," or 2-3 feet off the floor is best, because that is where you are when you are sleeping.
What is the best height for CO detectors? Are there current recommended heights or best practices to use when installing these things?