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D. EXHAUST REQUIREMENTS
1. General Exhaust Duct Work Information
Exhaust duct work should be designed and installed by a qualified professional. Improperly sized duct
work will create excessive back pressure which results in slow drying, increased use of energy, over
heating of the dryer, and shut down of the burner by the airflow (sail) switches, burner hi-limits, or tumbler
(basket) hi-heat thermostats.
CAUTION: DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
CAUTION: IMPROPERLY SIZED or INSTALLED EXHAUST DUCT WORK CAN
CREATE A POTENTIAL FIRE HAZARD.
NOTE: When a dryer is exhausted separately, it is recommended that a back draft damper be
installed.
NOTE: THE ML-200 MUST BE INDEPENDENTLY EXHAUSTED. COMMON DUCT
WORK IS NOT ACCEPTABLE.
The duct work should be laid out in such a way that the duct work travels as directly as possible to the
outdoors with as few turns as possible. Single or independent dryer venting is recommended.
The internal dimensions of the dryer's rectangular exhaust vent duct work is 8-inches by 20-inches (20.32
cm by 50.8 cm). The plant's exhaust duct must be at least 20-inches (50.8 cm) in diameter or for a
rectangular duct have a cross-sectional area of 315 square inches (2,032 square centimeters). The duct
work from the dryer to the outside exhaust outlet should not exceed 30 feet (9.14 meters). The shape
of the duct work is not critical so long as the minimum cross-sectional area is provided. It is suggested that
the use of 90º turns in ducting be avoided; use 45º angles instead. The radius of the elbows should
preferably be 1-1/2 times the width or diameter of the duct. Excluding basket/dryer elbow connections or
elbows used for outside protection from the weather, no more than two (2) elbows are used, the cross
section area of the duct work must be increased.
ALL duct work 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 duct work 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 duct work for periodic inspection and clean-out of lint from the duct work.
IMPORTANT: Exhaust back pressure measured by a manometer in the exhaust duct should not
exceed 0.3 inches of water column (0.74 mb).
NOTE: Where the exhaust duct work passes through a wall, ceiling, or roof made of combustible
materials, the opening must be 2-inches (5.08 cm) larger (all the way around) than the duct.
The duct must be centered within this opening.