Frigidaire FFLE3911QW Technical & Service Manual page 40

WARNING
FIRE HAZARD
Exceeding the length of duct pipe or number of
elbows as seen in "MAXIMUM LENGTH" charts can
cause an accumulation of lint in the exhaust system.
Plugging the system could create a fire hazard, and
increase the time of drying.
WARNING
FIRE HAZARD
Do not install flexible plastic or flexible foil venting
material.
If installing semi-rigid venting, do not exceed 8 ft.
(2.4 m) duct length.
WARNING
FIRE HAZARD
Do not install the Laundry Center where gasoline
or other flammables are kept or stored. If the dryer
is installed in a garage, it must be a minimum of 18
inches (45.7 cm) above the floor. Failure to do so can
result in death, explosion, fire or burns.
In installations where the exhaust system is not described in
the charts, use the following methods to determine if the
exhaust system is acceptable:
1. Connect an inclined or digital manometer between the
dryer and the point the exhaust connects to the dryer.
2. Set the dryer timer and temperature to air fluff (cool
down) and start the dryer.
3. Read the measurement on the manometer.
4. The system back pressure MUST NOT be higher than
0.6 inch of water column. If the system back pressure is less
than 0.6 inch of water column, the system is acceptable. If
the manometer reading is higher than 0.6 inch of water
column, the system is too restrictive and the installation is
unacceptable
Although vertical orientation of the exhaust system is
acceptable, certain extenuating circumstances could affect
the performance of the dryer:
1. Use the rigid metal duct work only.
2. Venting vertically through a roof may expose the
exhaust system to down drafts causing an increase in vent
restriction.
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