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D. EXHAUST REQUIREMENTS
NOTE: For 1 door dryers, the 20-inch (50.8 cm) diameter exhaust duct exits from the rear of the base. For
2 door dryers, the 20-inch (50.8 cm) diameter exhaust duct exits from the left side of the base.
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 tumbler hi-limit 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: DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
CAUTION: IMPROPERLY SIZED OR INSTALLED EXHAUST DUCTWORK CAN CREATE A
POTENTIAL FIRE HAZARD.
NOTE: THE DRYER MUST BE INDEPENDENTLY EXHAUSTED. COMMON DUCTWORK IS
NOT ACCEPTABLE.
The exhaust 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.
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.
IMPORTANT: Exhaust back pressure measured by a manometer/magnehelic in the exhaust duct must be
no less than 0 and must not exceed 0.3 in WC (0.74 mb).
NOTE: It is recommended that exhaust or booster fans not be used in the exhaust ductwork system except
where necessary to maintain exhaust back pressure (in the exhaust duct) between zero and 0.3 inch
water column. Where employed, booster fans must not activate the dryer airflow proving switch
(sail switch) when the dryer is not in operation.
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