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Smoke, Fire & Gas Detection FAQs

Where should carbon monoxide detectors be positioned?

CO detectors should be installed near potential sources of carbon monoxide, essentially any fuel-burning appliances. As you are likely to be most affected by CO in areas of your home that you spend the most time in it is advisable to install alarms in those areas as well, such as at head height in the living room and bedrooms. If your property has an attached garage with a connecting door through to the house, it is recommended to fit a CO alarm inside the house leading from that doorway.

Carbon monoxide has been proven to spread into neighbouring properties through open windows, as well as through loft spaces in semi-detached or terrace houses.

Battery powered carbon monoxide alarms can typically be installed wall-mounted or left free-standing on flat, level surface. Combined smoke & CO alarms or mains-powered CO alarms are typically installed on the ceiling.

  • Near an appliance: they should be placed within 1 to 3 metres horizontally from the appliance and between the height of the appliance to 150mm below the ceiling – i.e., not above a stove where it would be in the path of steam or fumes.
  • In living spaces: they should be positioned close to where the occupant's head is likely to be most of the time – e.g., on your bedside table.
  • On the ceiling: at least 30cm away from any wall, light fitting, or other obstruction.

Do not install CO alarms within 3 metres of doors or windows, above radiators, or immediately close to anything that gives off steam or fumes like a cooker or shower room. Similarly, it is not recommended to install detectors in dusty areas such as workshops or garages.

For more information, please check the manufacturer's instructions – you can download the PDF manual from the relevant product page on our site. You can also watch our video guide to positioning CO detectors.

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Reviewed: 14/09/2023 (doc:536 V1.0). Our articles are reviewed regularly. However, any changes made to standards or legislation following the review date will not have been considered. Please note that we provide abridged, easy-to-understand guidance. To make detailed decisions about your fire safety provisions, you might require further advice or need to consult the full standards and legislation.

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