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20 American Dryer Corp. 113247-3
!
!
Important
ADH-75 and ADH-120: No more than 4 dryers
should be connected to 1 main common duct.
ADH-170
Multiple Dryer Venting with 20-Inch (50.8 cm) Diameter
4,400 cfm (124.59 cmm) Exhaust Connections at Common Duct
!
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 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
must be at least Dimension A (12-inches [30.48 cm] for the
ADH-75; 18-inches [45.72 cm] for the ADH-120; 20-inches
[50.8 cm] for the ADH-170).
The illustration on the right 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 (20 feet [6.096 meters]) or has more than
1 elbow in it.
ADH-75
Multiple Dryer Venting with 12-Inch (30.48 cm) Diameter
1,200 cfm (33.98 cmm) Exhaust Connections at Common Duct
NUMBER OF DRYERS 4 3 2 1
MINIMUM CROSS-
SECTIONAL AREA
SQ IN 315 254 200 115
SQ CM 2032 1638 1290 729
MINIMUM ROUND
DUCT DIAMETER
IN 20 18 16 12
CM 51 46 41 30
NUMBER OF DRYERS 4 3 2 1
MINIMUM CROSS-
SECTIONAL AREA
SQ IN 455 380 255 115
SQ CM 2935 2452 1645 742
MINIMUM ROUND
DUCT DIAMETER
IN 24 22 20 18
CM 61 56 51 46
NUMBER OF DRYERS 3 2 1
MINIMUM CROSS-
SECTIONAL AREA
SQ IN 707 531 315
SQ CM 4561 3426 2032
MINIMUM ROUND
DUCT DIAMETER
IN 30 26 20
CM 76 66 51
ADH-120
Multiple Dryer Venting with 18-Inch (45.72 cm) Diameter
2,500 cfm (70.79 cmm) Exhaust Connections at Common Duct
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.
Important
ADH-170: No more than 3 dryers should be
connected to 1 main common duct.
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