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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 E, the minimum
diameter size at the “Y” or point of connections is 10-inches (25.4 cm) in diameter (80 square inches
[516.13 square centimeters] cross-sectional area). Additionally, the maximum ductwork travel from
the top of the dryer to the outside exhaust outlet must not exceed 15 feet (4.6 meters). Refer to the
illustration above for examples.
The vertical ducting need not be a minimum of 10-inches (25.4 cm) in diameter ALL the way into the
dryer. Connections inside the dryer can be 6-inches (15.24 cm) in diameter for the top basket (tumbler)
and for the bottom basket (tumbler) increased to 8-inches (20.32 cm) up to the top area of the dryer and
then at that point must be a minimum of 10-inches (25.4 cm) in diameter (80 square inches [516.13
square centimeters] cross-sectional area). Additionally, the length of the exhaust run cannot exceed 15
feet (4.6 meters) from the top of the dryer to the point where the exhaust ends outside.
4. 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.