Filter
Top Products
113159-2
www.amdry.com
13
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 the 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 dryer is 14-inches (35.56 cm) for a round duct or
12-1/2” x 12-1/2” (31.75 cm x 31.75 cm) for a square duct. THE DUCT SIZE
MUST NOT BE REDUCED ANYWHERE DOWNSTREAM OF THE
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 inches (0.74 mb) of water
column (W.C.).
It is suggested that the ductwork from each dryer not exceed 15 feet (4.57 meters) with no more than three
(3) elbows. If the ductwork exceeds 15 feet (4.57 meters) or has numerous elbows, the cross section area
of the ductwork 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).
IMPORTANT: It is recommended that exhaust or booster fans not be used in the exhaust ductwork
system.
IMPORTANT: For extended ductwork runs, the cross section area of the ductwork can only be
increased to an extent. When the ductwork approaches the maximum limits as noted
in this manual, a professional heating, ventilating, and air-conditioning (HVAC) firm
should be consulted for proper venting information.