A:AnswerPropane settles, carbon monoxide mixes freely. So if you have propane appliances, you want the detector mounted as low as possible.
Propane explosions often happen when the gas collect on the floor and fills to point where it reaches a pilot light.
A:AnswerInside the owners manual doesn't give you the exact square footage range that the device detects threats. I have it close just in case there is one or many.