•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.

 

DUCT

DRYER

EXHAUST

 

 

30°

 

 

DUCT

DRYER

EXHAUST

 

 

 

30°

AIR FLOW

 

 

 

 

DRYER

 

30°

EXHAUST

DUCT

 

 

 

MAIN COLLECTOR DUCT

 

 

 

 

DRYER

 

30°

EXHAUST

DUCT

 

 

 

D026IE3A

•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.

WARNING

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

•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.

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