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When considering installation, be aware that Carbon Monoxide has the same density as air and, therefore, distributes equally around a room. However, as CO is formed by a combustion process, the gas is likely to be hotter than the surrounding air and will be forced towards the ceiling. Detailed recommendations can be found in EN50292, a guide on selection, installation, use and maintenance for residential CO alarms. Ideally, an alarm should be fitted in every room that contains a fuel burning appliance and for additional safety, fit one in each bedroom.