If they are more than 10 years old it's time to replace them!
Smoke and carbon monoxide detectors must be replaced within the specified lifetime of the product, usually 5 to 10 years. Check the back of your alarm for the date of manufacture.
Replacing an old smoke detector is one of the easiest ways to help safeguard your family against smoke and fire.
Smoke alarms must be tested at least once a month. It is best to have a regular schedule to test it, say the first Saturday of each month, to ensure that it is not missed. Every smoke alarm in the house must be tested. This can be done by pressing the test button and ensuring that the alarm beeps.
Batteries should be replaced at least twice a year. A good way to help remember to do this is to change your batteries when you change your clocks for daylight saving time — when you spring forward or fall back.
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