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12 American Dryer Corp. 113231-4
E. EXHAUST REQUIREMENTS
1. General Exhaust Ductwork Information
Exhaust ductwork should be designed and installed by a qualified professional. Improperly sized ductwork
will create excessive back pressure, which results in slow drying, increased use of energy, overheating of
the dryer, and shutdown of the burner by the airflow (sail) switches, burner hi-limits, or basket (tumbler)
hi-heat thermostats. The dryer must be installed with a proper exhaust duct connection to the outside.
CAUTION: This dryer produces combustible lint and must be exhausted to the outdoors.
CAUTION: IMPROPERLY SIZED OR INSTALLED EXHAUST DUCTWORK CAN
CREATE A POTENTIAL FIRE HAZARD.
The ductwork 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. Single or independent dryer venting is recommended. It is suggested
that the use of 90º turns
be avoided; use 30º and/or 45º bends instead. The radius of the elbows 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
duct to be added should overlap the duct to which it is to be connected.
ALL ductwork joints must be
taped to prevent moisture and lint from escaping into the building. Inspection doors should be installed at
strategic points in the exhaust ductwork for periodic inspection and cleaning of lint from the ductwork.
IMPORTANT: It is recommended that exhaust or booster fans not be used in the exhaust ductwork
system.
IMPORTANT: Exhaust back pressure measured by a manometer in the exhaust duct must be no less
than 0 and must not exceed 0.3 inches (0.74 mb) of water column (W.C.).
NOTE: When the exhaust ductwork passes through a wall, ceiling, or roof made of combustible
materials, the opening must be 2-inches (5.08 cm) larger than the duct (all the way around).
The duct must be centered within this opening.
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 [0.05 mm]) thick.”
Outside Ductwork Protection
To protect the outside end of the 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
(refer to diagram on
page 13).
IMPORTANT: DO NOT use screens, louvers, or caps on the outside opening of the exhaust
ductwork.