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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 duct is added as per the illustration
[MAN2172] on page 19 and the illustration [MAN2171] on page 20.
The maximum length of venting from the last dryer to where it exhausts is the following:
VERTICAL -------- venting run must not exceed eight (8) feet. This calculation compensates for the
use of maximum of three (3) elbows including the two (2) elbows creating 180º
(turned downward) outside outlet.
HORIZONTAL ----- venting run must not exceed fifteen (15) feet. This calculation compensates for the
use of maximum of only one (1) elbow which is the outside outlet protection.
IMPORTANT: No more than four (4) dryers (eight [8] baskets [tumblers]) maximum should be
connected to one (1) main common duct. Refer to the applicable section of this
manual for specific common venting size.
NOTE: The distance between the dryer single ducts being connected to the main common duct must
be a minimum of 31-1/2 inches (the dryers width).
The duct work 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.
The illustration [MAN2172] on page 19 and the illustration [MAN2171] on page 20 show the minimum cross-
sectional are 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-sectional area of the duct can only be
increased to an extent. For extended duct work runs or where numerous elbows are
used, a professional HVAC firm should be consulted for proper venting information.
NOTE: Inspection doors should be installed at strategic points in the exhaust duct work for periodic
inspection and cleaning.
a. Multiple Dryer Venting - where each basket (tumbler) is individually vented.
With multiple venting where each basket is vented independently (a separate exhaust is used for each basket
[tumbler]) to the common main duct, a minimum of an 8-inch diameter duct (50 square inches cross-sectional
area) connection between the dryer and common main duct is acceptable providing this duct does not exceed
eight (8) feet in length.
IMPORTANT: No more than four (4) dryers (eight [8] baskets [tumblers]) can be connected to one
(1) common duct (vent).