American Dryer Corp. AD-530HS - Manual (Page 26)

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Important Venting Reminders
1. Duct work sizing and installation should be done by a qualified professional.
2. The dryer must be vented to the outdoors.
3. The duct work should be routed as short as possible to the outdoors with as few turns as possible.
4. Avoid 90º turns...use 30º or 45º turns instead.
5. The size (cross-sectional area) of the duct work will depend on the application (i.e.,single dryer venting,
common venting etc.), as well as the length of the duct and the amount of elbows. DO NOT EXCEED
THE SPECIFICATIONS NOTED IN THIS MANUAL.
IMPORTANT: UNDER NO CIRCUMSTANCES CAN THE DRYER BE VENTED TO
THE OUTDOORS USING A 6-INCH DIAMETER EXHAUST DUCT!!!
6. The inside of the duct work should be as smooth as possible...with no projections from the sheet metal
screws.
Ducts to be added should overlap the duct to which it is to be connected.
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 90º elbow must be used for a
horizontal run and when going vertically through the roof by using a 180º turn to point the opening
downward. The 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. The duct work exhaust outlets SHOULD NOT be located near make-up air openings. If make-up air
openings are located too close to the exhaust outlet, lint and fumes may be drawn back into the dryer area
through these openings.
13. Exhaust back pressure measured by a manometer at each basket (tumbler) exhaust duct should not exceed
0.3 inches water column when both baskets (tumblers) are operating.