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IMPORTANT: No more than four (4) dryers (eight [8] baskets [tumblers]) can be connected to one
(1) common duct vent.
NOTE: The distance between the dryer single ducts being connected to the main common duct must
be a minimum of 31-1/2” (80.01 cm) dryer’s width.
The ductwork should be laid out in such a manner where allowances are made at the rear
area of the dryer for removal of rear service panels/guards.
IMPORTANT: Individual ducts being added to the main common vent must enter the main common
vent ductwork at an angle not more than 45º in the direction of the airflow.
The illustration on the previous page shows the minimum cross-sectional area for multiple dryer
venting.
The maximum length of venting from the last dryer to where it exhausts is the following:
VERTICAL - venting run must not exceed 8 feet (2.44 meters).
HORIZONTAL - venting run must not exceed 15 feet (4.6 meters).
These figures must be increased in proportion if the main duct run from the last dryer has numerous
elbows or is unusually long. For extended runs or where more elbows are added, the cross-sectional
area of the duct can only be increased to an extent and a professional heating, venting, and air conditioning
(HVAC) firm should be consulted for proper venting information.
IMPORTANT: Exhaust back pressure must be no less than 0 and must not exceed 0.3 inches (0.74
mb) of water column (W.C.) when both baskets (tumblers) are operating.
NOTE: Inspection doors should be installed at strategic points in the exhaust ductwork for periodic
inspection and cleaning.