On Thu, 10 Feb 2005 05:25:23 GMT, "Bill Browning"
wrote:

They say to replace your CO alarms every 5 or 10 years. Why? If they still
test OK, why replace them?
Bill B.


imho:

I was told in my nfpa based training every 10, since a decade passing
brings new 'features' in the new products, and circuitry isn't tested
to last beyond a decade of use.

Might be a UL issue.

hth,

tom @ www.URLBee.com