Carbon Monoxide – Video 2

Protect Yourself and Your Family from Carbon Monoxide – Alarm Placement

Detailed guidance on where a carbon monoxide alarm can be fitted to in order to comply with Building Regulations when you have a solid fuel appliance installed.
See below the video for a transcript and links to our two other CO safety videos.

Make sure you also watch our second and third carbon monoxide videos:

Video 2 Transcript

Our previous video explained how the law in England and Wales requires new or replacement Solid Fuel installations in your home to have a carbon monoxide alarm fitted. But where can an alarm be fitted to comply with Building Regulations?

Your installer can help you select a compliant alarm model suitable for mounting either on the ceiling, or a wall. Some alarms are suitable for wall mounting, some for ceiling mounting and some for both – see the manufacturer’s instructions for details.

Carbon monoxide alarms must be in a permanent, fixed position and located in the same room as the appliance.

Ceiling Mounted Alarms

Ceiling mounted alarms should be placed at least 300mm away from any wall and between 1 to 3 metres horizontally from the appliance; anywhere in the blue area.

Ceiling Mounted Carbon Monoxide Alarm Compliant Position

Wall Mounted Alarms

Wall mounted alarms should be between 1 to 3 metres horizontally from the appliance and at least 150mm away from the ceiling. If there is a need to install it on a wall with doors or windows then the alarm must be located as high above these as possible, but still at least 150mm from the ceiling.

If the alarm needs to be installed in a room with a sloping ceiling, locate it towards the highest side of the room.

Wall Mounted Carbon Monoxide Alarm Compliant Position

The areas shown in red nearer the edge of the ceiling and the top of the walls are “dead air space” – do not place your alarm here as the lack of airflow may mean it will not be in time to warn you of a Carbon Monoxide escape.

Dead Air Space

Never place a CO Alarm:

  • In an enclosed space or where it can be obstructed
  • Above a sink or in a humid area
  • Next to a door, window, extractor fan or air vent
  • Near a cooking appliance
  • Where temperatures drop below -10˚C or above 40˚C unless your model is designed to do so

To recognise the signs and symptoms of carbon monoxide poisoning and what to do if you suspect a carbon monoxide escape, please see our third carbon monoxide safety advice video.

Further carbon monoxide safety guidance is also available at:

Or log into the technical area to read our Technical Note: