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Why would a smoke detector go off for no apparent reason?

Asked by AshlynM (10684points) March 18th, 2012

Very early this morning, I heard one of the smoke detectors go off. I got up to check the condo to see if there was indeed a fire, but there wasn’t. But the darn thing kept beeping for a full two hours before it finally stopped suddenly. I didn’t change the batteries, it stopped chirping on its own.

What could cause this?

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