16
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 (35.56 cm) for a round duct or 12-1/2 (31.75 cm) for a square duct. The
minimum duct size for a steam dryer is 16-inches (40.64 cm) for a round duct or
14-1/2 x 14-1/2 (36.83 cm x 36.83 cm) 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 (0.74 mb).
It is suggested that the duct work from each dryer not exceed 15 feet (4.57 meters) with no more than two
(2) elbows (excluding dryer connections and outside exhaust outlets). If the duct work exceeds 15 feet
(4.57 meters) 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 percent (20%) for each additional 15 feet (4.57
meters). The diameter of a round exhaust duct
should be
increased ten percent (10%) for each additional
15 feet (4.57 meters). Each 90º elbow is equivalent to an additional 30 feet (9.14 meters), and each 45º
elbow is equivalent to an additional 15 feet (4.57 meters).
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