What besides smoke might trigger a hardwired smoke detector


Sometimes my hardwired smoke alarm goes off for a few seconds for no apparent reason. For example I am not cooking or burning any substance. It is 3 years old and has a new battery.

Other than smoke, are there unusual gases or particles that will activate it?

The ionization type detector in question is a BRK First Alert Model No. 9120B

Best Answer

I've seen them triggered by steam, dust, and aerosols (hairspray).

Basically, they are succeptible to small, airborne particles. Most smoke detectors activate when the particles of smoke (or other substances) "block" the detector (which is usually either alpha radiation based or optical).