Smoke alarms play a vital role in reducing deaths and injuries from fire and have contributed to the almost 50% decrease in fire deaths since the late 1970s. It is estimated that 95% of U.S homes have at least one smoke alarm. Sixty-five percent of reported home fire deaths occurred in homes with no smoke alarms or no working smoke alarms. Properly installed and maintained smoke alarms save lives and protect against injury and loss due to fire.

Installation and maintenance tips

• Install smoke alarms on every level of your home, including the basement, making sure that there is an alarm outside every separate sleeping area. New homes are required to have a smoke alarm in every sleeping room and all smoke alarms must be interconnected.
• Hard-wired smoke alarms operate on your household electrical current. They can be interconnected so that every alarm sounds regardless of the fire's location. This is an advantage in early warning, because it gives occupants extra time to escape if they are in one part of the home and a fire breaks out in another part. Alarms that are hard-wired should have battery backups in case of a power outage, and should be installed by a qualified electrician.
• If you sleep with bedroom doors closed, have a qualified electrician install interconnected smoke alarms in each room so that when one alarm sounds, they all sound.
• If you, or someone in your home is deaf or hard of hearing, consider installing an alarm that combines flashing lights, vibration and/or sound.
• Mount smoke alarms high on walls or ceilings (remember, smoke rises). Ceiling mounted alarms should be installed at least four inches away from the nearest wall; wall-mounted alarms should be installed four to 12 inches away from the ceiling.
• If you have ceilings that are pitched, install the alarm near the ceiling's highest point.
• Don't install smoke alarms near windows, doors, or ducts where drafts might interfere with their operation.
• Never paint smoke alarms. Paint, stickers, or other decorations could keep the alarms from working.
• Smoke alarms should be replaced 10 years from the manufacture date.

Sensing systems

There are many brands of smoke alarms on the market, but they fall under 2 basic types: ionization and photoelectric.

Ionization and photoelectric smoke alarms detect different types of fires. Since no one can predict what type of fire might start in their home, the U.S. Fire Administration recommends that every home and place where people sleep have:

Both ionization AND photoelectric smoke alarms, OR
Dual-sensor smoke alarms, which contain both ionization and photoelectric smoke sensors.
Choose interconnected smoke alarms so that when one sounds, they all sound.

There are also alarms for people with hearing loss. These alarms may have strobe lights that flash and/or vibrate to alert those who are unable to hear standard smoke alarms when they sound.