On 1/17/2015 10:26 PM, Stormin Mormon wrote:
On 1/17/2015 6:36 PM, Frank wrote:

I'd say if they work they should be OK.
It's carbon monoxide detectors that have expiration dates.

Ionization smoke detetors use a radioactive
isotope that has a half life. They are good
for about ten years.


Good point but I never saw an expiration date on my very old detectors
and my wife was constantly testing them by not venting the oven enough
when broiling.

We replaced all of them last year when she was cooking, an alarm went
off and drove us nuts trying to figure where when it turned out to be
the CO detector telling us it was dying.

We replaced with more expensive but long battery life detectors maybe
good for 10 years before sending at annoying warnings.