Which of the following would indicate a need for smoke detector replacement?

A smoke detector that is over a decade old indicates a need for replacement due to the fact that smoke detectors have a typical lifespan of about 10 years. As smoke detectors age, they may not function as effectively, and their sensors can degrade, putting lives at risk. Regularly replacing smoke detectors ensures they operate at peak performance and can effectively detect smoke and alert occupants in case of fire.

The alarm sounding every month may be a routine test or a maintenance reminder rather than a signal for replacement. A green light generally indicates that the smoke detector is functioning properly, and proper installation does not affect the age or condition of the detector. Therefore, recognizing the age of the detector is crucial for ensuring ongoing safety in the event of a fire.