Filter
Top Products
14
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 shutdown 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 AD-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 (20.32 cm) by
20-inches (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 sq. cm). The duct work from the
dryer to the outside exhaust outlet must 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 must 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 than the duct (ALL the way around).
The duct must be centered within this opening.