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Smoke Detector Safety

 

The following information is provided by the United States Fire Administration

Information about Smoke Alarms

Smoke alarms have been around since the 1960s. The single-station, battery-powered smoke alarm, similar to the one we know today, became available to consumers in the 1970s. Approximately 93% of U.S. homes have at least one smoke alarm. Most states have laws requiring them in residential dwellings

Many homes still need detectors

Thousands of people die each year in home fires where smoke alarms aren't present.  More homes have smoke alarms that don't work than homes without alarms at all.  Poorly maintained units create a false sense of security among occupants. Approximately one-third of homes with smoke alarms that experience fires have smoke alarms that aren't working, and hundreds of people die each year in these fires.

Tragically, the grave importance of installing and maintaining smoke alarms has not yet been fully realized. Most people who die in home fires are not in the room where the fire starts; working smoke alarms alert people to fire and give them time to escape in a situation where minutes can mean the difference between life and death.

Working Smoke Alarms Save Lives

Having a smoke alarm cuts your chance of dying nearly in half if you have a home fire. By properly placing, regularly testing and maintaining your alarms, you can ensure that they are in fact working and will alert you if a fire breaks out. Make sure you buy only those alarms that bear the mark of an independent testing laboratory. Some alarms operate using an "ionization" sensor while others use a "photoelectric" sensor. An ionization alarm uses an extremely small quantity of radioactive material to make the air in the alarm chamber conduct electricity. Smoke from a fire interferes with the electrical current and triggers the alarm. A photoelectric alarm uses a tiny light source shining on a light sensitive sensor. The alarm is triggered when smoke from a fire interferes with the light. All tested and labeled smoke alarms offer adequate protection if they are properly installed and maintained.

Make Placement a Priority

Homes should have a working smoke detector on each level of the home outside of every sleeping area. New homes are required to have a smoke alarm in each sleeping area as well.

To slow the spread of smoke and fumes if a fire develops, you should sleep with your bedroom doors closed. If you sleep with your bedroom doors closed, a smoke alarm should be installed inside each bedroom. Alarms should also be installed in other areas of your home where people sleep. On floors without bedrooms, smoke alarms should be installed near living areas. In new homes, alarms should be hard-wired into the home electrical system and interconnected, so that if one alarm is activated, all alarms will sound the alarm signal.

 If your alarm plugs into a wall socket, make sure it has a restraining device to keep its plug from being pulled out. Never connect an alarm to a circuit that could be turned off at a wall switch. Most alarms are battery-powered and can be installed with a screwdriver and drill and by following the manufacturer's instructions.

Proper placement of detectors is important

Since smoke and deadly gases rise, alarms should be placed on the ceiling at least 4 inches from the nearest wall, or high on a wall, 4-12 inches from the ceiling. This 4-inch minimum is important to keep alarms out of possible "dead air" spaces, because hot air is turbulent and may bounce so much it may miss spots near a surface. Installing alarms near a window, door or fireplace is not recommended because drafts could detour smoke away from the unit. In rooms where the ceiling has an extremely high point, such as in vaulted ceilings, mount the alarm at or near the ceiling's highest point.

Maintenance is a Must

Smoke alarms that don't work are no good at all! That's why it is so important that you keep your smoke alarms in good shape. You can maintain your smoke alarms by:
Testing
Whether your alarms are hard-wired or battery-operated, we recommend that you test them once a month to make sure they are operating. A working smoke alarm greatly reduces your chances of dying in a home fire. Testing is the only way to ensure they are working to protect you. Test each alarm by pushing the test button and listening for the alarm. If you can't reach, stand under the alarm and push the test button with a broom handle.
Replacing Batteries
If your smoke alarms are battery operated, replace their batteries according to the manufacturer's instructions. NFPA recommends doing this at least once a year or when the alarm chirps, alerting you that the battery power is low. Replace the batteries immediately if you move into a new home. Make sure no one disables your smoke alarms by borrowing batteries for other uses. Everyone you live with should understand how critical it is to have working smoke alarms.
Cleaning
Just as you clean your home, your smoke alarms need to be cleaned. Make sure you follow the manufacturer's instructions about cleaning. Cobwebs and dust usually can be removed with a vacuum cleaner attachment. If you are going to be doing work nearby that could send dust in the air, cover the alarm with a shield. Also, shield the alarm if you are painting around it, and never paint on it. Remove the shield promptly after work is completed.

Dealing with Nuisance Alarms

Regularly cleaning your smoke alarms and following the manufacturer's instructions may help stop "nuisance" or false alarms. If this doesn't stop them, install a fresh battery in the alarms giving nuisance alarms. Evaluate where your alarms are placed if the problem still persists. Cooking vapors and steam can set off a smoke alarm. If the alarm is near the kitchen or bathroom, try moving it farther away. If nuisance alarms continue, install a new smoke alarm.  An increase in dust in the area due to construction, etc. can also lead to nuisance alarms. 

 

No Substitute for Smoke Alarms

Fire protection in the home must start with smoke alarms. There are many other kinds of alarms, which may be designed to detect such factors as high temperatures, rapid changes in temperature, and certain gases produced in fires. However, these alarms are not as effective as smoke alarms in giving the first warning when a fire breaks out.  Tests performed on the speed of warning given by smoke alarms and heat alarms for many types of typical home fires showed smoke alarms consistently give first warning -- often by enough of a margin to make a major difference in your chances of escaping alive. Smoke and deadly gasses spread farther and faster than heat.

Contrary to popular belief, the smell of smoke may not wake a sleeping person. Instead, the poisonous gases and smoke produced by a fire can numb the senses and put one into a deeper sleep.

Smoke Alarms Are Cost-Effective

A battery-operated smoke alarm for the home retails for less than $10. Smoke alarms with extra features can cost up to $25. A smoke alarm for a typical hard-wired system costs $14 - 18.  Smoke alarms for people with hearing impairments cost approximately $100 each. Batteries cost $1 to $2, depending on the brand.  In 1994, home fires caused $481,000 in damage every hour.

 

     
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