Smoke detector certification is an affidavit that all smoke detectors (and/or other fire safety mechanisms) in a dwelling are in the right locations, of the right number, and in good working order at the time of sale. In some states and municipalities, this requires certification from the fire department or other local authority, and in many other states, it's enough that the seller or representative thereof signs the document certifying the status of smoke detectors in the home.
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