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b. Single Dryer Venting - with common (top basket [tumbler] and bottom basket [tumbler]
connected together) exhaust connections.
If the top and bottom baskets (tumblers) connect or “Y” together as noted is Section E1, the minimum
diameter size at the “Y” or point of connections is 10 inches in diameter (80 square inches cross-sectional
area). Additionally, the maximum duct work travel from the top of the dryer to the outside exhaust outlet must
not exceed fifteen (15) feet. Refer to the illustration [MAN2113] located above for examples.
The vertical ducting need not be a minimum of 10-inches in diameter all the way into the dryer. Connections
inside the dryer can be 6-inches in diameter for the top basket (tumbler) and for the bottom basket (tumbler)
increased to 8-inches up to the top area of the dryer and then at that point must be a minimum of 10-inches in
diameter (80 square inches cross-sectional area). Additionally, the length of the exhaust run cannot exceed
fifteen (15) feet from the top of the dryer to the point where the exhaust end outside.
3. Multiple Dryer Venting (with Common Main Duct)
If it is not feasible to provide separate exhaust ducts for each dryer, ducts from individual dryers or baskets
(tumblers) may be channeled into a common main duct. Each dryer/basket (tumbler) is provided with a back
draft damper. The individual ducts should enter the bottom or side of the main duct at an angle of not more
than 45º in the direction of the airflow.