Replacement periods for alarms - BRE Group
Researching when optical smoke detectors and alarms should be replaced
This research study aimed to identify the optimum replacement periods for optical smoke alarms and detectors, which are used to detect the presence of a fire and provide early warning to occupants. Ten different models of each type were tested and suitable performance limits for these were established using smoke sensitivity measurement equipment. This portable equipment was then used to test 107 commercial smoke detectors and 85 domestic smoke alarms in the field, during the period from February 2019 to January 2020.
The stakeholder group, comprising the Fire Industry Association, Scottish Fire and Rescue Service, Scottish Government, Detector Testers and BRE Global, reviewed the data that was gathered.
It was observed that the sensitivities of smoke detectors and smoke alarms, tested in service environments, were relatively consistent independent of age. However, older domestic smoke alarms demonstrated a slight increase in the sensitivity leading to an earlier alarm response. It was observed that the sensitivity of both smoke alarms and detectors increased when they were dirtier.
By analysing the sensitivity responses with the age of the devices, the research group recommended replacement periods for commercial smoke detectors, with and without drift compensation, as well as for domestic smoke alarms. Further recommendations were also made to improve practices around the use of these life safety devices.
BRE Global are exploring a similar collaborative study with heat alarms (present in domestic kitchens) to investigate whether these devices, when contaminated with dust and oil, could result in a delayed response during a fire.
We kindly request that you do not download and circulate this briefing paper, but instead inform your colleagues and others of this URL. That will help us to gauge the level of interest in our publications and enable readers to provide feedback.
If you would like to be kept informed about new related publications and the latest industry news, please register to receive our monthly e-newsletters.
BRE is keen to obtain your views about this publication. We would be grateful if you could spare one minute of your time to give your feedback. Thank you.