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14 American Dryer Corp. 113231-4
IMPORTANT: For extended ductwork runs, the cross section area of the ductwork can only be
increased to an extent. When the ductwork approaches the maximum limits noted in
this manual, a professional heating, ventilating, and air-conditioning (HVAC) firm
should be consulted for proper venting information.
3. Multiple Dryer (Common) Venting
If it
is not feasible to provide separate exhaust ducts for each dryer, ducts from individual dryers may be
channeled into a “common main duct.” The individual ducts should enter the bottom or side of the main
duct at an angle not more than 45º in the direction of airflow. The main duct should be tapered, with the
diameter increasing before each individual duct (10-inch [25.4 cm] minimum) is added.
IMPORTANT: No more than four (4) dryers should be connected to one main common duct.
The illustrations on page 15 show the minimum cross-sectional area for multiple dryer round or square
venting. These figures must be increased if the main duct run from the last dryer to where it exhausts to
the outdoors is unusually long (over 15 feet [4.6 meters]) or has numerous (more than one [1]) elbow in it.
IMPORTANT: For extended ductwork runs, the cross section area of the ductwork can only be
increased to an extent. Maximum proportional ductwork runs cannot exceed 15 feet
(4.6 meters) with one (1) elbow. When the ductwork approaches the maximum limits
as noted in this manual, a professional heating, ventilating, and air-conditioning
(HVAC) firm should be consulted for proper venting information.
Multiple Dryer Venting (Gas) with 10-Inch (25.4 cm) Diameter
900 cfm (25.48 cmm) Exhaust Connections at Common Duct