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MULTIPLE DRYER (COMMON) VENTING
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 as noted
in this manual, a professional heating, ventilating, and air-conditioning (HVAC) firm
should be consulted for proper venting information.
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 is added. The minimum diameter of the individual ductwork (Dimension
A) must be at least 8-inches (20.32 cm).
IMPORTANT: No more than four (4) dryers should be connected to one (1) main common duct.
The illustration below shows 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
longer than Dimension B or has more than one (1) elbow in it.
For gas models Dimension B is 20 feet (6.096 meters).
Multiple Dryer Venting (Gas) with 8-Inch (20.32 cm) Diameter
460 cfm (13 cmm) Exhaust Connections at Common Duct
MINIMUM CROSS-
SECTIONAL AREA
MINIMUM ROUND
DUCT DIAMETER
NOTE 1 Opening must be 2-inches (5.08 cm) larger than the duct (all the way around). The duct must be centered within this opening.
NOTE 2 Distance should be 2 times the diameter of the duct to the nearest obstruction.
113307 - 7
NUMBER OF DRYERS
SQ IN
SQ CM
IN
CM
4
3
164
120
80
1058
774
516
14
12
10
35.56
30.48
25.4
Maytag Co.
2
1
54
348
8
20.32
11
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