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Home smoke alarms must be replaced after 10 years

Smoke alarms are subject to random failures. According to the National Fire Protection Association, in 10 years there is roughly a 30% probability of failure before replacement. After 15 years, there is more than a 50/50 chance that your alarm has failed. Replacing your alarm after 10 years protects against that high likelihood of alarm failure. Additionally, you must still test your alarm monthly to ensure that it is still working.

For more information on smoke alarm safety.