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12 American Dryer Corp. 113406-1
NOTE: As per the National Fuel Gas Code, “Exhaust ducts for Type 2 clothes dryers shall be
constructed of sheet metal or other noncombustible material. Such ducts shall be equivalent in
strength and corrosion resistance to ducts made of galvanized sheet steel not less than 26
gauge (0.0195-inches [0.5 mm]) thick.”
IMPORTANT: It is recommended that exhaust or booster fans not be used in the exhaust ductwork
system.
Outside Ductwork Protection
To protect the outside end of horizontal ductwork from the weather, a 90° elbow bent downward should be
installed where the exhaust exits the building. If the ductwork travels vertically up through the roof, it
should be protected from the weather by using a 180° turn to point the opening downward. In either case,
allow at least twice the diameter of the duct between the duct opening and the nearest obstruction.
IMPORTANT: DO NOT use screens, louvers, or caps on the outside opening of the exhaust
ductwork.
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 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: The minimum duct size for a gas unit is 12-inches (30.48 cm) for a round duct and
10-inches x 10-inches (25.4 cm x 25.4 cm) for a square duct. The minimum duct size
for a steam unit is 20-inches (50.80 cm) for a round duct and 18-inches x
18-inches (45.72 cm x 45.72 cm) for a square duct. THE DUCT SIZE MUST
NOT BE REDUCED ANYWHERE DOWNSTREAM OF THE DRYER.