HSE safety alert on gas flues in ceiling voids

The Health and Safety Executive (HSE) has issued a safety alert aimed at properties with gas central heating boilers sited on internal walls.

The alert warns of a potential poisoning risk from a particular arrangement of flues for gas boilers. Such boilers, most commonly found in multi-storey flats and apartments built since 2000, may have a flue that runs through the ceiling void. The HSE has become aware that some flues may not have been installed properly or may have fallen into disrepair.

A flue not in good condition could affect the performance of the boiler, which may produce high levels of carbon monoxide (CO). If CO enters the ceiling void through any breaks in the flue and then gets into the living space below, occupants are at risk of CO poisoning.

Gas installers need to be able to visually check the flue system when servicing or maintaining boilers. Therefore a means of access should be provided at strategic locations.

The HSE advises property owners and landlords to ensure gas appliances are serviced and maintained at least annually by a competent, registered installer. Fitting carbon monoxide alarms is also recommended.

The alert can be found on the HSE's website at www.hse.gov.uk/gas/domestic/alert021008.htm. It gives advice on potential warning signs, what should do be done if you think you may be at risk, relevant legal requirements and sources of further information.