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Installation
ductwork must be 4-inches (10 cm). No more than 1 elbow should be used in the exhaust duct run
(including tumbler/dryer elbow connections or elbows used for outside protection from the weather).
If more than 1 elbow is used, the cross-sectional area of the ductwork must be increased.
Vertical Venting
If vertical dryer venting is used, the length of the ductwork from the dryer to the outside exhaust
outlet, must not exceed 12 feet (3.5 meters). The diameter of this ductwork must be 4-inches
(10 cm). No more than 3 elbows should be used in the exhaust duct run (including tumbler/dryer
elbow connections or elbows used for outside protection from the weather). If more than 3 elbows
are used, the cross-sectional area of the ductwork must be increased.
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 airow. The main duct should be
tapered, with the diameter increasing before each individual duct is added. The multiple dryers must
have separate backdraft dampers when connected through a shared venting.
IMPORTANT
• No more than four dryers should be connected to one main common duct.
The illustration below shows the minimum cross-sectional area for multiple dryer round or square
venting. These gures must be increased if the main duct run from the last dryer to where it
exhausts to the outdoors is longer than 12 feet (3.5 meters) or has more than one elbow in it.
NOTE
• Clearance to surfaces adjacent to ductwork must comply with applicable national and local
codes.
• Distance should be 2 times the diameter of the duct to the nearest obstruction.
NUMBER OF DRYERS 4 3 2 1
MINIMUM CROSS-
SECTIONAL AREA
SQ IN 80 80 54 30
MINIMUM ROUND
DUCT DIAMETER
IN 10 10 8 6
2:5
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