In my motorhome the CO detector was not operational, no green light. Pulled it out and found a loose wire, probably pulled loose by the past owner? So hooked it up and the thing started beeping loudly. Would not quit, so unplugged it and ordered a replacement. Ours was mounted about 4 inches off the floor in a hallway. Went to the CO site and they say carbon monoxide is lighter than air, and shouild be mounted high near the ceiling. Why are the rv manufacturers installing them at your feet? I will be purchasing a new extra unit and installing where it should be. Where is yours installed?