Fires
Do you have a Smoke Alarm?
Smoke alarms are the residential fire safety success story of the past quarter
century. Smoke alarm technology has been around since the 1960s. But the
single-station, battery-powered smoke alarm we know today became available
to consumers in the 1970s, and since then, the home fire death rate has
been reduced by half. Most states have laws requiring them in residential
dwellings.
Important: Working smoke alarms are essential in every household. It is
necessary to practice home fire drillsto be certain everyone is familiar with the
smoke alarm signal, and to determine if there are any obstacles to a quick
and safe evacuation (including the inability for some to awaken to the smoke
alarm signal).
Facts & figures
A 2004 U.S. telephone survey found that 96% of the households surveyed
had at least one smoke alarm.
Roughly half of home fire deaths result from fires in the small percentage of
homes with no smoke alarms.
Homes with smoke alarms (whether or not they are operational) typically have
a death rate that is 40-50% less than the rate for homes without alarms.
In one-quarter of the reported fires in homes equipped with smoke alarms, the
devices did not work. Households with non-working smoke alarms now
outnumber those with no smoke alarms.
Why do smoke alarms fail? Most often because of missing, disconnected or
dead batteries.
Source: NFPA's "U.S. Experience with Smoke Alarms and Other Fire
Detection/Alarm Equipment."
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.
A life-saving test: check your smoke alarms regularly
Test your smoke alarms once a month, following the manufacturer's
instructions.
Replace the batteries in your smoke alarm once a year, or as soon as the
alarm "chirps" warning that the battery is low. Hint: schedule battery
replacements for the same day you change your clocks from daylight savings
time to standard time in the fall.
Never "borrow" a battery from a smoke alarm. Smoke alarms can't warn you of
fire if their batteries are missing or have been disconnected.
Don't disable smoke alarms even temporarily. If your smoke alarm is sounding
"nuisance alarms," try relocating it farther from kitchens or bathrooms, where
cooking fumes and steam can cause the alarm to sound.
Regularly vacuuming or dusting your smoke alarms, following the
manufacturer's instructions, can keep them working properly.
Smoke alarms don't last forever. Replace yours once every 10 years. If you
can't remember how old the alarm is, then it's probably time for a new one.
Consider installing smoke alarms with "long-life" (10-year) batteries.
Plan regular fire drills to ensure that everyone knows exactly what to do when
the smoke alarm sounds. Hold a drill at night to make sure that sleeping family
members awaken at the sound of the alarm. Some studies have shown that
some children may not awaken to the sound of the smoke alarm. Know what
your child will do before a fire occurs.
If you are building a new home or remodeling your existing home, consider
installing an automatic home fire sprinkler system. Sprinklers and smoke
alarms together cut your risk of dying in a home fire 82 percent relative to
having neither – a savings of thousands of lives a year.
Sensing systems
Most smoke alarms use one of two common sensing systems for detecting a
fire.
Ionization-type smoke alarms have a small amount of radioactive material
between two electrically charged plates, which ionizes the air and causes
current to flow between the plates. When smoke enters the chamber, it
disrupts the flow of ions, thus reducing the flow of current and activating the
alarm.
Photoelectric-type alarms aim a light source into a sensing chamber at an
angle away from the sensor. Smoke enters the chamber, reflecting light onto
the light sensor; triggering the alarm.
Ionization vs. photoelectric
Photoelectric alarms respond slightly faster to smoldering fires; ionization
alarms respond slightly faster to flaming fires. Since, as a practical matter;
you can not predict the type of fire that will occur; the slight difference is
irrelevant. Either type of alarm will detect nearly every type of fire quickly.
Some manufacturers offer dual-chamber alarms that use both sensor systems.
Smoke alarms are the residential fire safety success story of the past quarter
century. Smoke alarm technology has been around since the 1960s. But the
single-station, battery-powered smoke alarm we know today became available
to consumers in the 1970s, and since then, the home fire death rate has
been reduced by half. Most states have laws requiring them in residential
dwellings.
Important: Working smoke alarms are essential in every household. It is
necessary to practice home fire drillsto be certain everyone is familiar with the
smoke alarm signal, and to determine if there are any obstacles to a quick
and safe evacuation (including the inability for some to awaken to the smoke
alarm signal).
Facts & figures
A 2004 U.S. telephone survey found that 96% of the households surveyed
had at least one smoke alarm.
Roughly half of home fire deaths result from fires in the small percentage of
homes with no smoke alarms.
Homes with smoke alarms (whether or not they are operational) typically have
a death rate that is 40-50% less than the rate for homes without alarms.
In one-quarter of the reported fires in homes equipped with smoke alarms, the
devices did not work. Households with non-working smoke alarms now
outnumber those with no smoke alarms.
Why do smoke alarms fail? Most often because of missing, disconnected or
dead batteries.
Source: NFPA's "U.S. Experience with Smoke Alarms and Other Fire
Detection/Alarm Equipment."
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.
A life-saving test: check your smoke alarms regularly
Test your smoke alarms once a month, following the manufacturer's
instructions.
Replace the batteries in your smoke alarm once a year, or as soon as the
alarm "chirps" warning that the battery is low. Hint: schedule battery
replacements for the same day you change your clocks from daylight savings
time to standard time in the fall.
Never "borrow" a battery from a smoke alarm. Smoke alarms can't warn you of
fire if their batteries are missing or have been disconnected.
Don't disable smoke alarms even temporarily. If your smoke alarm is sounding
"nuisance alarms," try relocating it farther from kitchens or bathrooms, where
cooking fumes and steam can cause the alarm to sound.
Regularly vacuuming or dusting your smoke alarms, following the
manufacturer's instructions, can keep them working properly.
Smoke alarms don't last forever. Replace yours once every 10 years. If you
can't remember how old the alarm is, then it's probably time for a new one.
Consider installing smoke alarms with "long-life" (10-year) batteries.
Plan regular fire drills to ensure that everyone knows exactly what to do when
the smoke alarm sounds. Hold a drill at night to make sure that sleeping family
members awaken at the sound of the alarm. Some studies have shown that
some children may not awaken to the sound of the smoke alarm. Know what
your child will do before a fire occurs.
If you are building a new home or remodeling your existing home, consider
installing an automatic home fire sprinkler system. Sprinklers and smoke
alarms together cut your risk of dying in a home fire 82 percent relative to
having neither – a savings of thousands of lives a year.
Sensing systems
Most smoke alarms use one of two common sensing systems for detecting a
fire.
Ionization-type smoke alarms have a small amount of radioactive material
between two electrically charged plates, which ionizes the air and causes
current to flow between the plates. When smoke enters the chamber, it
disrupts the flow of ions, thus reducing the flow of current and activating the
alarm.
Photoelectric-type alarms aim a light source into a sensing chamber at an
angle away from the sensor. Smoke enters the chamber, reflecting light onto
the light sensor; triggering the alarm.
Ionization vs. photoelectric
Photoelectric alarms respond slightly faster to smoldering fires; ionization
alarms respond slightly faster to flaming fires. Since, as a practical matter;
you can not predict the type of fire that will occur; the slight difference is
irrelevant. Either type of alarm will detect nearly every type of fire quickly.
Some manufacturers offer dual-chamber alarms that use both sensor systems.
