Smoke alarms should be tested at least once a month. All smoke alarms have a test button that you push to check out the entire alarm, including its sensitivity (how much smoke it takes to set it off). If the testing mechanism does not work properly, the alarm should be replaced immediately. Never use open flame devices to test an alarm.

Older adults and the physically impaired may have problems reaching their alarms to test them. There is one brand of smoke alarm on which the test feature can be activated by shining a flashlight on it. Another brand has an automatic test that activates at the same time and day, once a week. These models can be used where proper testing might not otherwise be done.

Smoke alarms need no maintenance other than changing batteries (in those that have batteries) and an occasional vacuuming of dust or cobwebs. Every smoke alarm comes with a homeowner booklet, which describes how to use and take care of that particular alarm. You should read that booklet and keep it in a safe place for future reference.

Click here for more information from FEMA about smoke alarms

Smoke Alarms Facts from Phoenix Fire