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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.
IMPORTANT: Minimum duct size for dryer is 12-inches (30.48 cm) round duct. Duct size must not
be reduced anywhere downstream of dryer.
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.
IMPORTANT: 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 can only
be increased to an extent. 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.
b. Common Venting
If it is not feasible to provide separate exhaust ducts for each dryer, ducts from individual dryers may be
channeled into a “common main duct.” The individual ducts should enter the bottom or the side of the
main common duct at an angle not more than 45º in the direction of airflow. The main duct should be
tapered, with the diameter increasing before each individual duct 12-inch (30.48 cm) is added.
IMPORTANT: No more than four (4) dryers or eight (8) pockets total should be connected to one
(1) common duct.
Minimum duct size between dryer and common duct is 12-inches (30.48) in diameter. This duct must not
travel more than 30 feet (9.14 meters) and include no more than 3 elbows (which includes both dryer and
common duct connections).
NOTE: Refer to illustrations on page 14 and page 15 for examples of multi dryer (common) venting.
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 m) 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).
CAUTION: IMPROPERLY SIZED or INSTALLED EXHAUST DUCT WORK CAN
CREATE A POTENTIAL FIRE HAZARD.