US Fire Administration: Smoke alarms should be replaced every 8 to 10 years. Federal Emergency Management Agency: Most alarms installed today have a lifespan of about 8 to 10 years. After this time, the entire unit should be replaced. National Fire Protection Association: Replace all smoke alarms, including alarms that use 10-year batteries and hardwired alarms, when they are 10 years old or sooner if they don’t respond properly. Consumer Product Safety Commission: Replace alarms every 10 years, or follow the manufacturer’s replacement instructions.
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