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22 American Dryer Corp. 113068-7
The shape of the ductwork is not critical so long as the minimum cross section area is provided. It is
suggested that the use of 90° turns in ducting
be avoided; use 30° and/or 45° angles instead. The radius of
the elbow should preferably be 1-1/2 times the diameter of the duct.
ALL ductwork should be smooth inside with no projections from sheet metal screws or other obstructions,
which will collect lint. When adding ducts, the ducts to be added should overlap the duct to which it is
connected.
ALL ductwork joints must be taped to prevent moisture and lint from escaping into the
building. Additionally, inspection doors should be installed at strategic points in the exhaust ductwork for
periodic inspection and cleaning of lint from the ductwork.
The internal dimensions of the dryer’s square exhaust vent ductwork is 18-inches x 18-inches (45.72 cm x
45.72 cm). A transition piece to 24-inches (60.96 cm) in diameter round is supplied. The location’s exhaust
duct must be the minimum exhaust size requirement of (24-inches [60.96 cm] round duct or 460 square
inches [2,968 square centimeters] square duct) the ductwork from the dryer to the outside exhaust outlet
for a horizontal run with no more than one (1) elbow must not exceed 30 feet (9.14 meters) for gas and
steam dryers (refer to the illustrations on
page 24). For locations with more than one (1) elbow, the
minimum exhaust size for gas and steam models must use a 28-inch (71.12 cm) round duct (650 square
inches [4,194 square centimeters] duct) must be used. The horizontal or vertical duct total run on gas and
steam models must not exceed 35 feet (10.67 meters), which includes the use of no more than four (4)
elbows (refer to the illustrations on
page 23).
IMPORTANT: For extended ductwork runs or where more than the specified number of elbows are
used, a professional heating, ventilating, and air-conditioning (HVAC) firm should be
contacted for proper venting information.
IMPORTANT: It is recommended that exhaust or booster fans not be used in the exhaust ductwork
system.
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.”