10 American Dryer Corp. 112175-9
If the length of the duct run or quantity of elbows used
exceeds the above noted specifications, the cross-sectional
area of the ductwork may need to be increased.
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 HVAC firm
should be consulted for proper venting information.
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 45° in the direction of airflow. The main duct
should be tapered, with the diameter increasing before each
individual 10-inch (25.4 cm) duct (when dryer common
exhaust is used) is added.
IMPORTANT: No more than four dryers or eight tumblers
total should be connected to one main common duct.
The main duct may be any shape provided that the minimum
cross-sectional area is maintained. The illustration below
shows the minimum cross-sectional area for multiple dryer
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 30 feet [9.1 meters]) or has numerous
elbows (more than one) in it.
Single Dryer Venting (8-Inch Duct)
IMPORTANT: A minimum exhaust duct size of 8-inches
(20.3 cm) must be used.
For an 8-inch (20.3 cm) run where a maximum of two elbows
are used (refer to the illustration below), the ductwork from
the dryer outlet must not exceed 10 feet (3.0 meters).
This calculation of 10 feet (3.0 meters) compensates or
allows for the use of a maximum of two elbows. Refer to the
illustration below.
SINGLE DRYER VENTING
If the length of the duct run or quantity of elbows used
exceeds the above noted specifications, the cross-sectional
area of the ductwork may need to be increased.
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 HVAC firm
should be consulted for proper venting information.
Single Dryer Venting (10-Inch Duct)
IMPORTANT: A minimum exhaust duct size of 10-inches
(25.4 cm) must be used for extended runs.
For a 10-inch (25.4 cm) run where a maximum of two elbows
are used (refer to the illustration below), the ductwork from
the dryer outlet must not exceed 45 feet (13.7 meters).
This calculation of 45 feet (13.7 meters) compensates or
allows for the use of a maximum of two elbows. Refer to the
illustration below.
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