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15
MULTIPLE DRYER (Common) VENTING
If it is not feasible to provide separate exhaust ducts for each dryer, ducts for individual dryers may be channeled
into a common main duct. Each dryer is provided with a back draft damper. The individual ducts should enter the
bottom or side of the main duct at an angle not more than 45° in the direction of the airflow.
The main common duct may be any shape so long as the minimum cross-sectional area is provided. The main
duct should be tapered with the diameter increasing before each individual 10-inch (25 cm) duct is added (refer
to Illus. C for Horizontal Venting and Illus D for Vertical Venting).
IMPORTANT: No more than four (4) dryers maximum should be connected to one (1) main
common duct with a vertical run.
NOTE: Distance between dryer single ducts being connected to the main common duct must be a
minimum of 38-1/4” - 97.15 cm - (dryer width).
Duct work should be laid out in such a manner where allowances are made at rear area of the
dryer for removal of rear service panels or guards.
The illustrations on page 16 show the minimum cross-section area for multiple dryer venting. These figures
must be increased in proportion if the main duct run from the last dryer to where it exhausts has numerous
elbows or is unusually long.
IMPORTANT: For extended duct work runs, the cross-section area of the duct can only be increased
to an extent. For extended duct work runs, a professional HVAC firm should be
consulted for proper venting information.
Refer to page 16 for Multiple Dryer Horizontal Venting and Vertical Venting examples/illustrations.