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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 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 gas dryer or 72 Kw electric dryer is 14-inches for a round
duct or 12.50" for a square duct. The minimum duct size for a steam dryer or 80 Kw
electric dryer is 16-inches for a round duct or 14.50" x 14.50" 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.
It is suggested that the duct work from each dryer (minimum 14 inches for a gas dryer or 72 Kw electric
dryer and 16 inches for a steam dryer or 80 Kw electric dryer) not exceed twenty (20) feet with no more
than two (2) elbows (excluding dryer connections and outside exhaust outlets). If the duct work 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 90° elbow is equivalent to an additional thirty (30) feet, and each 45° elbow is equivalent to an
additional fifteen (15) feet.