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8514-311-001 REV PR
7.1.10 Exhaust Installation
WARNING
A CLOTHES DRYER PRODUCES COMBUSTIBLE
LINT AND MUST BE EXHAUSTED OUTDOORS.
THE AREA AROUND THE CLOTHES DRYER
SHOULD BE KEPT FREE OF LINT.
INFORMATION
STATIC BACK PRESSURE should be a
maximum of 7.6 mm w.c. (0.3-inch w.c.)
at the rear exhaust outlet of the dryer. If
multiple dryers are connected to the
common duct, ensure the back draft
damper is installed properly.
Exhausting of the dryer(s) should be planned and constructed so that no air restrictions occur.
Any restriction due to pipe size or type of installation can cause slow drying time, excessive
heat, and lint in the room.
From an operational standpoint, incorrect or inadequate exhausting can cause a cycling of the
high limit thermostat, which shuts off the main burners and results in inefficient drying.
The exhaust duct connection near the top of the dryer will accept a 203 mm (8 inches) round
duct. Individual exhausting of the dryers is required. All heat, moisture, and lint should be
exhausted outside by attaching a pipe of the proper diameter to the dryer adapter collar and
extending it out through an outside wall. This pipe must be very smooth on the inside, as rough
surfaces tend to collect lint, which will eventually clog the duct and prevent the dryer from
exhausting properly. All elbows must be smooth on the inside. All joints must be made so the
exhaust end of one pipe is inside the next one downstream. The addition of an exhaust pipe
tends to reduce the amount of air the blower can exhaust. This does not affect the dryer
operation if held within practical limits. For the most efficient operation, it is recommended that
no more than 4.25 m (14 feet) of straight 203 mm (8 inches) diameter pipe with two right angle
elbows be used for each cylinder. The design of the vent system shall be such that any
condensate formed when operating the dryer from cold shall either be retained and re-
evaporated or discharged.
INFORMATION
A small diameter duct will restrict airflow;
a large diameter duct will reduce air
velocity - both contributing to lint build
up. An inspection door should be
provided for periodic clean out of the
main duct.
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