How often should you test a smoke alarm in the United States?
The U.S. Fire Administration says test a smoke alarm every month. That is the same for a 9-volt battery, a sealed 10-year battery, and an alarm wired into the house. Replace a 9-volt battery, and the backup battery on a wired alarm, at least once a year.
Household
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Not legal advice. Always consult a professional.
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