According to National Fire Protection Association (NFPA) research, most American homes have at least one smoke alarm. But do you know how old your smoke alarms are? If you’re like most people, you’re probably not so sure.

A recent survey conducted by NFPA revealed that only a small percentage of people know how old their smoke alarms are, or how often they need to be replaced. That lack of awareness is a concern for NFPA, along with fire departments throughout the country, because smoke alarms don’t last forever.

NFPA 72, National Fire Alarm Code, requires smoke alarms be replaced at least every 10 years, but because the public is generally unaware of this requirement, many homes have smoke alarms past their expiration date, putting people at increased risk.

As the official sponsor of Fire Prevention Week for more than 90 years, NFPA is promoting this year’s Fire Prevention Week campaign, “Don’t Wait – Check the Date! Replace Smoke Alarms Every 10 Years,” to better educate the public about the critical importance of knowing how old their smoke alarms are and replacing them once they’re 10 years old. Fire Prevention Week is October 9 to 15.

Check with your local fire departments to find out when they are hosting events in support of Fire Prevention Week and this year’s campaign.

To find out how old your smoke alarm is and its expiration date, simply look on the back of the alarm where the date of manufacture is marked. The smoke alarm should be replaced 10 years from that date (not the date of purchase).

Smoke alarms should be tested monthly, and batteries should be replaced once a year or when they begin to chirp, signaling that they’re running low.