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• Dryer exhaust duct should enter the main duct at an
angle of no more than 30
° pointing in the direction of
the air flow. Ducts entering the main duct from
opposite sides should be staggered so as not to oppose
each other. See illustration below.
• Provisions should be made for periodic lint removal
and cleaning of the main collector duct.
• The outside end of the main duct should have a
weather hood (with hinged dampers) installed to
prevent passage of weather elements, insects, dust,
and dirt into the dryers.
• If a weather hood cannot be used, the outside end of
the main duct should have a sweep elbow installed,
and be directed downward as shown on page 24. If the
main duct travels vertically through a roof rather than
through a wall, install 180
° sweep elbow on the end
of the duct with outlet at least 60.96 cm (24 inches)
above the highest part of the building.
• Sufficient make-up air must be supplied to replace air
exhausted from dryers.
NOTE: Where the exhaust duct pierces the wall or
ceiling, an opening having a diameter of 10.2 cm
(4 inches) larger than the diameter of the exhaust
duct shall be provided, and the exhaust duct centered
within the opening.
• Damper, Part No. 58786, should be installed in each
dryer’s exhaust system. This will prevent a backdraft
when dryer is not in use, and will keep the exhaust air
in balance within the central exhaust system.
IMPORTANT: Provisions must be made for make-up
air.
IMPORTANT: If several dryers are exhausted into a
main collector duct, it is essential that ductwork be
adequate in size and properly constructed for efficient
operation.
DRYER EXHAUST DUCT
DRYER EXHAUST DUCT
DRYER EXHAUST DUCT
DRYER EXHAUST DUCT
AIR FLOW MAIN COLLECTOR DUCT
30° 30°
30°
D026IE3A
30°
To reduce the risk of fire and the
accumulation of combustion gases, DO NOT
exhaust dryer air into a window well, gas
vent, chimney or enclosed, unventilated
area, such as an attic, wall, ceiling, crawl
space under a building or concealed space
of a building.
W045
WARNING