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How long do smoke detectors last?

Asked by srmorgan (6773points) April 2nd, 2013

We have been in this house for 19 years and some of the smoke detectors have never been touched.
These are wired into a socket in the ceiling, they are not battery-operated. They might not meet code anymore, now that I think of it.

Do the filters need to be changed? Can we even find replacement smoke detectors that will plug into the ceiling?
Thanks

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