Filter
Top Products
21
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 measured by a manometer at the dryer exhaust duct 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.
b. Multiple Dryer Venting - where baskets (tumblers) of each dryer “Y” together.
With multiple venting where the top basket (tumbler) and bottom basket (tumbler) are connected or “Y”
together as described in
Section E (page 12 through page 14), the minimum diameter size at the “Y”
(point of connection) and main common duct is 10-inches (25.4 cm) in diameter (80 square inches
[516.13 square centimeters] cross-sectional). This duct run cannot exceed 8 feet (2.44 meters) in
length.