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13
NOTE: 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) water column (W.C.).
It is suggested that the ductwork from each dryer not exceed the limitations noted in this manual. If the
ductwork exceeds these limitations or has numerous elbows, the cross-sectional area of the ductwork must
be increased in proportion to length or number of elbows in it.
IMPORTANT: For extended ductwork runs, the cross-sectional area of the ductwork can only be
increased to an extent. When the ductwork approaches the maximum limits as noted
in this manual, a professional heating, venting, and air conditioning (HVAC) firm
should be consulted for proper venting information.
The ductwork 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 ductwork 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 ductwork for periodic
inspection and cleaning.
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.
To protect the outside end of the horizontal ductwork from the weather, a 90º elbow bent downward should
be installed where the exhaust exits the building. If the exhaust ductwork 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, louvers, or caps on the outside opening of the exhaust
ductwork.
NOTE: Refer to the illustrations on page 14 and page 15 for examples of single dryer venting.