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11
E. EXHAUST REQUIREMENTS
Exhaust duct work should be designed and installed by a qualified professional. Improperly sized duct work will
create excessive back pressure which will result in slow drying, increased use of energy, overheating of the dryer,
and shut down of the burner by the airflow (sail) switches, burner hi-limits, or tumbler (basket) hi-limit thermostats.
Where possible, it is suggested to provide a separate exhaust duct for each dryer.
CAUTION: IMPROPERLY SIZED or INSTALLED EXHAUST DUCT WORK CAN
CREATE A POTENTIAL FIRE HAZARD.
The exhaust duct work must be laid out in such a way that the duct 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-
sectional area is provided.
When single dryer venting is used, for horizontal or vertical venting the minimum duct size is 12-inches (30.48 cm)
in diameter and the duct work from the dryer to the outside exhaust outlet must not exceed a distance of 35 feet
(10.67 meters) and have no more than two (2) elbows (including both connection to dryer and outside protection).
In the case of multiple (common) venting, using the applicable duct size (diameter) noted in this manual, for
horizontal venting the distance from the last dryer to the outside outlet must not exceed 15 feet (4.57 meters)
and have no more than one (1) elbow (including outside protection). In the case of common vertical venting, the
distance from the last dryer to the outside outlet must not exceed 25 feet (7.62 meters) and have no more than
three (3) elbows (including outside protection).
IMPORTANT: Exhaust back pressure measured by a manometer at the dryer exhaust duct area must
not exceed 0.3 inches of water (0.74 mb).
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 sheet metal screws or other obstructions which will collect lint.
When adding ducts, the duct to be added should overlap the duct to which it is to be connected. ALL duct work
joints must be taped to prevent moisture and lint from escaping into the building. Also, inspection doors should
be installed at strategic points in the exhaust duct work for periodic inspection and cleaning.
Wherever the exhaust duct work passes through a wall, ceiling, or roof made of combustible materials, the
opening must be 2-inches (5.08 cm) larger (ALL the way around) than the duct. The duct must be centered
within this opening.
If the duct work run (distance) or the amount of elbows required exceeds the limits noted in this manual, the size
(diameter/cross-sectional area) of the duct work must be increased in proportion to the length or number of
elbows added. When the duct work approaches the maximum limits as noted in this manual, a professional
Heating, Venting, Air Conditioning (HVAC) firm must be consulted for proper venting information.
1. Dryer exhaust connection. The dryer is shipped with a 12-inches (30.48 cm) exhaust adapter which for
shipping purposes is shipped inside of the dryer’s tumbler (basket). This exhaust adapter must be installed
(with screws provided) once the dryer is in place prior to making any exhaust connections.
IMPORTANT: Minimum duct size for dryer is 12-inches (30.48 cm) round duct. Duct size must not
be reduced anywhere downstream of dryer.