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NOTE: When the exhaust ductwork passes through a wall, ceiling, or roof made of combustible
materials, the opening must be 2-inches (5.08 cm) larger than the duct (all the way around). The
duct must be centered within this opening.
To protect the outside end of the horizontal ductwork from the weather, a 90° elbow bent downward
should be installed where the exhaust exits the building. If the exhaust ductwork travels vertically up
through the roof, it should be protected from the weather by using a 180° turn to point the opening
downward. In either case, allow at least twice the diameter of the duct between the duct opening and the
nearest obstruction.
IMPORTANT: DO NOT use screens, louvers, or caps on the outside opening of the exhaust
ductwork.
2. Single Dryer Venting
When possible, it is suggested to provide a separate exhaust duct for each dryer. The exhaust duct should
be laid out in such a way that the ductwork travels as directly as possible to the outdoors with as few turns
as possible. It is suggested that the use of 90° turns in ducting
be avoided; use 30° and/or 45° angles
instead. The shape of the exhaust ductwork
is not critical as long as the minimum cross section area is
provided.
IMPORTANT: Minimum duct size for a gas, electric, or steam dryer with a vertical run and not
more than three (3) elbows (including dryer connection and outside outlets) is 16-inches (40.64 cm)
for a round duct or 14-1/2” by 14-1/2” (36.83 cm by 36.83 cm) for a square duct. DUCT SIZE
MUST NOT BE REDUCED ANYWHERE DOWNSTREAM OF DRYER.
IMPORTANT: Exhaust back pressure measured by a manometer at each basket (tumbler) exhaust
duct area must be no less than 0 and must not exceed 0.3 in WC (0.75 mb, 75 Pa).
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