On 01/17/2015 05:36 PM, Frank wrote:

[snip]


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

I bought Smoke and CO detectors in 2006. The smoke detector (First Alert
with both ionization and photoelectric sensors) has instructions to
replace it after 10 years.

AS to the CO detector (NightHawk), it failed and had to be replaced in
2013. The new one has no such message.

--
Mark Lloyd
http://notstupid.us

"The Christian religion not only was at first attended with miracles,
but even at this day cannot be believed by any reasonable person without
one." -- David Hume