Replacing a smoke alarm
In our home there are 3 smoke alarms, all wired into the house wiring.
All are the same age (about 22 yrs). There's a high pitched noise
coming from one of them.
In a recent discussion, one guy told me to replace all of them, not
just the one. He said new ones aren't compatible with the new ones. I
didn't ask him what he meant about being compatible.
So, can anyone tell me what this means? Do I have to replace all 3?
Thanks,
Myrna
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