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E. EXHAUST REQUIREMENTS
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-heat
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:
When a dryer is exhausted separately,
it
is
recommended
that a back draft damper be
installed.
NOTE:
When dryers are exhausted into a multiple (common) exhaust line, each dryer
must be
supplied with a back draft damper.
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.
When single dryer venting is used, the ductwork from the dryer to the outside exhaust outlet
must not
exceed
20 feet (6.1 meters). In the case of multiple (common) dryer venting, the distance from the last
dryer to the outside exhaust outlet
must not exceed
20 feet (6.1 meters). 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 or 45º angles instead. The radius of the elbows
should preferably be
1-1/2
times the diameter of the duct. Excluding basket (tumbler) and dryer elbow connections or elbows used for
outside protection from the weather, no more than two (2) elbows
should be
used in the exhaust duct run.
If more than two (2) elbows are used, the cross section area of the ductwork
must be
increased in proportion
to number of elbows added.
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 at the dryer exhaust duct area
must
be
no less than 0 and
must not exceed
0.3 inches (0.74 mb) of water column
(W.C.).
NOTE:
When the exhaust ductwork 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.
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