First Alert SC9120B Benutzerhandbuch

Minimum coverage for Smoke Alarms, as recommended by the
National Fire Protection Association (NFPA), is one Smoke Alarm on
every floor, in every sleeping area, and in every bedroom (See
“Regulatory Information For Smoke Alarms” for details on the NFPA 
recommendations). 

For CO Alarms, the National Fire Protection Association (NFPA) 
recommends that a CO Alarm should be centrally located outside of
each separate sleeping area in the immediate vicinity of the bedrooms.
For added protection, install additional CO Alarms in each separate 
bedroom, and on every level of your home. 

In general, install combination Smoke and Carbon Monoxide
Alarms:
•

On every level of your home, including finished attics and basements.

•

Inside every bedroom, especially if people sleep with the door partly
or completely closed.

•

In the hall near every sleeping area. If your home has multiple 
sleeping areas, install a unit in each. If a hall is more than 40 feet 
(12 meters) long, install a unit at each end.

•

At the top of first-to-second floor stairs.

•

At the bottom of the basement stairs.

•

For additional coverage, install Alarms in all rooms, halls, and storage
areas, where temperatures normally remain between 40˚ F and 
100˚ F (4˚ C and 38˚ C).

•

When installing on the wall, the top edge of Smoke Alarms should
be placed between 4 inches (102 mm) and 12 inches (305 mm)
from the wall/ceiling line.

•

When installing on the ceiling, place the alarm as close to the 
center as possible.

•

In either case, install at least 4 inches (102 mm) from where the 
wall and ceiling meet. See “Avoiding Dead Air Spaces” for more
information.

NOTE: For any location, make sure no door or other obstruction could
keep carbon monoxide or smoke from reaching the Alarm.

Installing Smoke/CO Alarms in Mobile Homes
For minimum security install one Smoke/CO Alarm as close to each
sleeping area as possible. For more security, put one unit in each room.
Many older mobile homes (especially those built before 1978) have little
or no insulation. If your mobile home is not well insulated, or if you are
unsure of the amount of insulation, it is important to install units on
inside walls only.

Do NOT locate this Smoke/CO Alarm:
•

In garages, kitchens, furnace rooms, crawl spaces and unfinished
attics. Avoid extremely dusty, dirty or greasy areas.

•

Where combustion particles are produced. Combustion particles
form when something burns. Areas to avoid include poorly ventilated
kitchens, garages, and furnace rooms. Keep units at least 20 feet 
(6 meters) from the sources of combustion particles (stove, furnace,
water heater, space heater) if possible. In areas where a 20-foot 
(6 meter) distance is not possible – in modular, mobile, or smaller
homes, for example – it is recommended the Smoke/CO Alarm be
placed as far from these fuel-burning sources as possible. The
placement recommendations are intended to keep these Alarms at 
a reasonable distance from a fuel-burning source, and thus reduce
“unwanted” alarms. Unwanted alarms can occur if a Smoke/CO
Alarm is placed directly next to a fuel-burning source. Ventilate 
these areas as much as possible.

•

Within 5 feet (1.5 meters) of any cooking appliance. In air streams
near kitchens. Air currents can draw cooking smoke into the smoke
sensor and cause unwanted alarms. 

•

In extremely humid areas. This Alarm should be at least 10 feet 
(3 meters) from a shower, sauna, humidifier, vaporizer, dishwasher,
laundry room, utility room, or other source of high humidity.

•

In direct sunlight.

•

In turbulent air, like near ceiling fans or open windows. Blowing air
may prevent CO or smoke from reaching the sensors.

•

In areas where temperature is colder than 40˚ F (4˚ C) or hotter than
100˚ F (38˚C). These areas include non-airconditioned crawl spaces,
unfinished attics, uninsulated or poorly insulated ceilings, porches,
and garages.

•

In insect infested areas. Insects can clog the openings to the 
sensing chamber.

•

Less than 12 inches (305 mm) away from fluorescent lights. 
Electrical “noise” can interfere with the sensor.

•

In “dead air” spaces. See “Avoiding Dead Air Spaces”.

“Dead air” spaces may prevent smoke from reaching the Smoke/CO
Alarm. To avoid dead air spaces, follow installation recommendations
below.

On ceilings, install Smoke/CO Alarms as close to the center of the 
ceiling as possible. If this is not possible, install the Smoke/CO Alarm 
at least 4 inches (102 mm) from the wall or corner.

For wall mounting (if allowed by building codes), the top edge of
Smoke/CO Alarms should be placed between 4 inches (102 mm) and 
12 inches (305 mm) from the wall/ceiling line.

On a peaked, gabled, or cathedral ceiling, install the first Smoke/CO
Alarm within 3 feet (0.9 meters) of the peak of the ceiling, measured 
horizontally. Additional Smoke/CO Alarms may be required depending
on the length, angle, etc. of the ceiling's slope. Refer to NFPA 72 for
details on requirements for sloped or peaked ceilings.