writes:
I once read that you are supposed to replace the smoke detector every
10 years or something like that. I think that is just a gimmick to
sell them. If they work when the button is pushed, they work.....

See:

http://www.nfpa.org/itemDetail.asp?c...ookie%5Ftest=1

The executive summary is that if you test all of your smoke alarms
once a month, then you can get away with waiting to replace them until
they fail, but if you don't test them regularly, you're better off
replacing them on a regular schedule, and once every ten years is
extremely reasonable, because "in ten years there is roughly a 30%
probability of failure before replacement."


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