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a. Ducting (Horizontal and Vertical)
1) For single dryer horizontal ducting the minimum duct size is 16-inches (40.64 cm) in diameter, the
duct run should not have more than one (1) elbow (including outside protection), and must not
exceed 40 feet (12.19 meters) in total length. With single dryer vertical ducting the minimum duct
size is 18-inches (45.72 cm) in diameter, the duct run should not have more than three (3) elbows
(including outside protection), and must not exceed 20 feet (6.1 meters) in total length.
IMPORTANT: When the ductwork approaches the maximum limits as noted in this manual, a
professional heating, venting, and air conditioning (HVAC) firm must be consulted for
proper venting information.
ALL 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. Inspection doors should be installed at strategic points in the
exhaust ductwork for periodic inspection and cleaning of lint from the ductwork.
IMPORTANT: 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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