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E. Exhaust Requirements
General Information
Exhaust duct work should be designed and installed by a competent technician. Improperly sized duct work will
create excessive back pressure which results in slow drying, increased use of energy, and shutdown of the burner
by airflow (sail) switch, burner hi-limit, or lint chamber hi-heat protector thermostat.
Where possible, it is suggested that a sperate (single) exhaust duct for each dryer/tumbler be provided.
CAUTION: IMPROPERLY SIZED or INSTALLED EXHAUST DUCT WORK CAN
CREATE A POTENTIAL FIRE HAZARD.
CAUTION: DRYER MUST BE VENTED TO THE OUTDOORS.
The exhaust duct work should be laid out in such a way that the duct 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-
sectional area is provided.
It is suggested that the use of 90º turns in ducting be avoided; use 30º or 45º angles instead.
The duct work should be smooth inside with no projections from the sheet metal screws or other obstructions
which 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
cleaning.
The duct work material must meet applicable National, State, and Local codes, or in Canada, the duct work
material must meet applicable Canadian National, Provincial, and Local codes.
IMPORTANT: When connecting duct work to the dryer’s top basket (tumbler) exhaust duct work, 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 90º elbow bent downward should be
installed where the exhaust exits the building. If the exhaust duct work travels vertically up through the roof, it
should be protected from the weather by using a 180º turn to point the opening downward. In either case, allow
at least twice the diameter of the duct between the duct opening and nearest obstruction.
IMPORTANT: DO NOT use screens or caps on the outside opening of exhaust duct work.