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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. Ductwork should be routed as short as possible to the outdoors with as few elbows as possible.
4. Avoid 90º turns, use 30º or 45º turns instead.
5. The size of the ductwork must be a minimum of 8-inches (20.32 cm).
6. The inside of the ductwork should be as smooth as possible with no projections from sheet metal screws.
Ducts 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 or clean out doors should be installed throughout strategic points in the ductwork for periodic
inspection and cleaning.
9. Whenever the duct 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 horizontal
run and when vertically through a 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, louvers, or caps on the outside opening of the exhaust ductwork.
12. Exhaust back pressure measured by a manometer at the dryer exhaust duct area must be no less than 0
and must not exceed 0.3 inches (0.74 mb) of water column (W.C.).
13. WARNING - DRYER MUST NEVER BE OPERATED WITHOUT THE LINT FILTER AND SCREEN
IN PLACE, EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED.
14. Exhaust ductwork outlets should not be located in an area directly where the make-up air openings are
located.
IMPORTANT: It is recommended that exhaust or booster fans not be used in the exhaust ductwork
system.
NOTE: As per the National Fuel Gas Code, “Exhaust ducts for type 2 clothes dryers shall be
constructed of sheet metal or other noncombustible material. Such ducts shall be equivalent in
strength and corrosion resistance to ducts made of galvanized sheet steel not less than
0.0195-inches (26 gauge [0.05 mm]) thick.”