American Dryer Corp. AD-27 - Manual (Page 20)

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IMPORTANT: For extended ductwork runs, the cross section 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.
IMPORTANT VENTING REMINDERS
1. Ductwork size and installation should be done by a qualified professional.
2. The dryer must be exhausted to the outdoors.
3. The dryer exhaust must not be connected into any gas vent, chimney, wall, ceiling, or concealing space of
a building.
4. Ductwork should be routed as short as possible to the outdoors with as few elbows as possible.
5. Avoid 90º turns ... use 30º or 45º turns instead.
6. The inside of the ductwork should be as smooth as possible ... with no projections from sheet metal
screws.
7. ALL ducts should be taped to prevent moisture and lint from escaping into the building.
8. Inspection/clean out doors should be installed throughout strategic points in the ductwork for periodic
inspection and cleaning.
9. When the ductwork passes through 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.
10. The outside of the ductwork must be protected from the weather. A 90º elbow must be used for a
horizontal run and when vertically through a roof by using 180º turn to point the opening downward. Distance
between the exhaust duct and the nearest obstruction (i.e., roof or ground) must be twice the diameter of
the duct.
11. DO NOT use screens or caps on the outside opening of the exhaust ductwork.
12. Exhaust back pressure, measured by a manometer at the dryer’s exhaust duct area, must not exceed 0.3
inches (0.74 mb) of water column (W.C.).