16
D. EXHAUST REQUIREMENTS
NOTE:
For 1 door dryers, the 24-inch (60.96 cm) diameter exhaust duct exits from the rear of the
base. For 2 door dryers, the 24-inch (60.96 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 basket (tumbler) hi-limit
thermostats.
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 90º turns in ducting be avoided; use 30º and/or 45º 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.
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