American Dryer Corp. Super AD-30 - Manual (Page 21)

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IMPORTANT VENTING REMINDERS
1. Duct work size and installation should be done by a qualified professional.
2. The dryer must be exhausted to the outdoors.
3. Duct work should be routed as short as possible to the outdoors with as few elbows as possible.
4. Avoid 90° turns ... use 30° or 45° turns instead.
5. The size of the duct work must be a minimum of 10-inches if the exhaust length exceeds 10 feet.
6. The inside of the duct work 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 duct work for periodic
inspection and cleaning.
9. Wherever the duct passes through combustible materials, the opening must be 2-inches larger (all the way
around) than the duct. The duct must be centered within this opening.
10. The outside of the duct work must be protected from the weather. A 90° elbow must be used for horizontal
run and when vertically through a roof by using a 180° 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 duct work.
12. Exhaust back pressure measured by a manometer at the dryer exhaust duct area must not exceed 0.3
inches of water column.