ADC AD-444, Installation Manual

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112174-7 www.adclaundry.com 11
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 20 feet (6.09
meters) or has more than 1 elbow in it.
Multiple Dryer Venting with 10-Inch (25.4 cm) Diameter
1,060 cfm (30.02 cmm) Exhaust Connections at Common Duct
NOTE 1 Opening from combustible materials 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.
Multiple Dryer Venting with 8-Inch (20.32 cm) Diameter
530 cfm (15.01 cmm) Exhaust Connections at Common Duct
A = 10-inches (25.4 cm)
B = 20 feet (6.09 meters)
NUMBER OF DRYERS 4 3 2 1
MINIMUM CROSS-
SECTIONAL AREA
SQ IN 254 200 155 80
SQ CM 1638 1290 999 516
MINIMUM ROUND
DUCT DIAMETER
IN 18 16 14 10
CM 45.72 40.64 35.56 25.4
A = 8-inches (20.32 cm)
B = 20 feet (6.09 meters)
NUMBER OF DRYERS 8 7 6 5 4 3 2 1
MINIMUM CROSS-
SECTIONAL AREA
SQ IN 254 200 155 80
SQ CM 1638 1290 999 516
MINIMUM ROUND
DUCT DIAMETER
IN 18 16 14 10
CM 45.72 40.64 35.56 25.4
NOTE 1 Opening from combustible materials 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.
The length of the ductwork from the dryer to the outside
exhaust outlet must not exceed 20 feet (6.09 meters). The
minimum diameter of this ductwork must be at least 8-inches
(20.32 cm) when each pocket/tumbler is vented individually
and 10-inches (25.4 cm) when both pockets/tumblers are
combined. Including tumbler/dryer elbow connections or
elbows used for outside protection from the weather, no more
than two 90° elbows should be used in the exhaust duct run.
If more than the equivalent of two 90° elbows are used, the
cross-sectional area of the ductwork must be increased.
Multiple Dryer (Common) Venting
IMPORTANT: For extended ductwork runs, the cross-
sectional 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 8-inches (20.32 cm) for individual
pockets/tumblers or 10-inches (25.4 cm) for individual dryers.
IMPORTANT: To maintain proper performance, no more
than 4 dryers should be connected to 1 main common
duct.
A = 20 feet (6.10 meters)
B = 8-inches (20.32 cm)
Single Dryer Venting without Transition Piece