"tflfb" wrote in message
...
Is there a life expectancy for smoke alarms that are hard wired into a
home.

Today the hard wired smoke alarms went off, nothing burning in the house.

Any ideas?

Thanks

Tom

the match theory only works on heat detectors. Today's modern smokes are
usually ion or a combination of ion and heat. Take them apart blow them out
with compressed caned air. Clean with a q-tip and to not touch any of the
parts inside with your fingers. The oils on your hands will have you doing
this again in a few months. I clean mine yearly as well as testing them.