Installation & Upkeep
Remember to change your detector battery when you change your clock twice a year. A smoke alarm will typically last five to seven years. Homeowners should install smoke alarms on every level of the home, including the basement, and in every bedroom. The alarm can be placed on the ceiling or on the wall; however, it is recommended that it be placed on the ceiling. The alarm should be no less than six inches from corners.
Ionization & Photoelectric Smoke Alarms
There are two basic types of smoke alarms for the average home: Ionization and photoelectric. Ionization alarms are much more common. Ionization alarms sound more quickly when flaming, fast moving fire occurs. Photoelectric alarms are quicker at sensing smoldering, smoky fire with no flames.
In general, it is better to have an ionization alarm in your home if you are only going to have one type. The U.S. Fire Administration (USFA) recommends that both types be installed. Photoelectric may be better in kitchens and other areas of the home where frequent ionization alarm activation is common.