wrote in message
...
I have a condo and it has the original smoke detectors, FireX. Probably
about 20 years old. they don't take batteries, that's probably why they have
not received much attention. The are hardwired to AC with a signal wire to
the other 2 detectors. Don't believe they are on a separate circuit, should
they be ?

Should they be replaced ?

Recommendations !?

Thanks

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Given the cost we replace and trash (no gifting) @ 5 years.