When I considered buying a CO detector, I had some questions as to where it should be placed. For example, is next to the bed, at face level, a good place? I thought the answer would be found in NFPA 720, "Reccommended Practice for the Installation of Household Carbon Monoxide Warning Equipment." I WAS WRONG. After spending $23, here is what the standard told me: (720-5.1.1.3) "Each alarm...should be located...as specified in the installation instructions."