22
American Dryer Corp.
113068 - 10
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.”
