CO gas can be anywhere and everywhere. CO gas is equal to or slightly lighter then air, and disperses evenly with the air in a room. Therefore, install a CO alarm where air circulation is best. Do not mount a CO alarm within 1 foot of the ceiling/wall intersection or other dead air spaces. For earliest warning of CO presence we recommend that you install at least one CO alarm on every separate living level of your home.
You should always consult your user manual which contains instructions specific to your smoke alarm model. If you do not have a copy of your user manual, please click here to visit the quell resource library where you will be able to download a copy.