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IMPORTANT: For extended duct work runs, the cross section area of the duct 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 should be
consulted for proper venting information.
ALL 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. Inspection doors should be installed at strategic points in the exhaust duct
work for periodic inspection and clean-out of lint from the duct work.
NOTE: Where the exhaust duct 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.
c. Outside Duct Work Protection
1) To protect the outside end of horizontal duct work from the weather, a 90° 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 180° 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 of opening of exhaust duct
work.
3. Multiple Dryer (Common) Venting
a. Horizontal 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 side of the main
duct at an angle not more than 45° in the direction of air flow and should be spaced at least 46-1/8"
(117.16 cm) apart. The main duct should be tapered, with the diameter increasing before each individual
14-inch - 35.56 cm - (minimum for gas dryers or 60 Kw/72 Kw electric dryers) or 16-inch - 40.64 cm -
(minimum 80 Kw electric dryers for steam dryers) duct is added.
IMPORTANT: The AD-115ES is not provided with a back draft damper. When exhausted into a
multiple (common) exhaust line, a back draft damper must be installed at each dryer
duct.
IMPORTANT: No more than four (4) dryers should be connected to one main common duct.