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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° and/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: For a dryer that is vented horizontally, the minimum duct size for a gas dryer is
14 inches for a round duct or 12-1/2" for a square duct. The minimum duct size for
a steam dryer is 10 inches for a round duct or 14-1/2" x 14-1/2" for a square duct.
THE DUCT SIZE MUST NOT BE REDUCED ANYWHERE DOWN
STREAM OF THE 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.
It is suggested that the duct work from each dryer not exceed fifteen (15) feet with no more than two (2) elbows
(excluding dryer connections and outside exhaust outlets). If the duct work exceeds fifteen (15) 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 fifteen (15) 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 (30) feet, and each 45º elbow is equivalent to an additional fifteen (15) feet.