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EXHAUST REQUIREMENTS
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, and shutdown of the burner by the
airflow (sail) switch, burner hi-limit chamber hi-heat protector thermostat.
Where possible, it is suggested to provide a separate (single) exhaust duct for each dryer.
CAUTION: IMPROPERLY SIZED OR INSTALLED EXHAUST DUCT WORK CAN
CREATE A POTENTIAL FIRE HAZARD.
CAUTION: DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
The exhaust duct work should be laid out in such a way that the work travels as directly as possible to the outdoors with
as few turns as possible. The shape of the duct work is not critical so long as the minimum cross section area is
provided. Single or independent dryer venting is recommended.
It is suggested that the use of 90° turns be avoided; use 30° or 45° angles instead.
The 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 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 cleaning.
IMPORTANT
When connecting duct work to the dryer exhaust duct, be sure that when screws are
:
used they do not restrict the operation (both opening and closing) of the damper.
NOTE:
When the exhaust duct passes through a wall, ceiling, or roof made of combustible materials,
the opening must be 2-inches larger (all the way around) than the duct. The duct must be
centered within this opening.
To protect the outside end of horizontal duct work from the weather, a 90° elbow bent downward should be installed
where the exhaust exits the building. If the duct work travels vertically up though 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 (i.e., roof of ground level).
IMPORTANT
DO NOT use screens or caps on the outside of opening of exhaust duct work.
:
IMPORTANT
Exhaust back pressure measured by a manometer at the dryer exhaust are must not
:
exceed 0.3 inches of water column (W.C.)
COMMERCIAL MULTI LOAD DRYERS - MDG30, MC2, PC2, PNA, and MNA
07/02
6-2
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