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2. Single Dryer Venting
Where 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 duct work travels as directly as possible to the outdoors with as few turns
as possible. It is suggested that the use of 90° turns in the ducting be avoided; use 30° or 45° angles instead.
The shape of the exhaust duct work is not critical so long as the minimum cross section area is provided.
IMPORTANT: Minimum duct size for a dryer is 16-inches for a round duct or 14.25-inches for a square
duct. Duct size must not be reduced anywhere down stream of dryer.
IMPORTANT: Exhaust back pressure measured by a manometer at each basket (tumbler) exhaust
duct area should not exceed 0.3 inches of water column (W.C.).
It is suggested that the duct work from each dryer be a minimum of 16-inches for horizontal runs with no
more than one (1) elbow and 18-inches for vertical runs with no more than three (3) elbows without
exceeding twenty (20) feet (excluding dryer connections and outside exhaust outlets). If the duct exceeds
twenty (20) feet or has numerous elbows, the cross section area of the duct work must be increased in
proportion to the length and number of elbows in it. In calculating duct size, the cross section area of a square
or rectangular duct must be increased by twenty (20) percent for each additional twenty (20) feet. The
diameter of a round exhaust duct should be increased ten (10) percent for each additional fifteen (15) feet.
Each 90º elbow is equivalent to an additional thirty-six (36) feet, and each 45º elbow is equivalent to an
additional eighteen (18) feet.