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• Dryer unit 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 dryer units.
• 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 the following page. 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 24 inches (61 cm)
above the highest part of the building.
• Sufficient make-up air must be supplied to replace air
exhausted from dryer units.
NOTE: Where the exhaust duct pierces the wall or
ceiling, an opening having a diameter of 4 inches (10.2
cm) 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 unit 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 dryer units 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