| CAUTION: |
! | This dryer produces combustible lint and must |
be exhausted to the outdoors. |
When possible, it is suggested to provide a separate (single) exhaust duct for each dryer.
CAUTION:
!IMPROPERLY SIZED OR INSTALLED EXHAUST DUCTWORK CAN CREATE A POTENTIAL FIRE HAZARD.
The exhaust ductwork should be laid out in such a way that the ductwork travels as directly as possible to the outdoors with as few turns as possible. The shape of the ductwork is not critical provided that the minimum cross section area is maintained. Single or independent dryer venting is recommended.
It is suggested that the use of 90° turns be avoided; use 30° or 45° angles instead.
The ductwork should be smooth inside with no projections from sheet metal screws or other obstructions, which will collect lint. When adding ducts, the ducts to be added should overlap the duct to which it is connected. ALL ductwork joints must be taped to prevent moisture and lint from escaping into the building. Additionally, inspection doors should be installed at strategic points in the exhaust ductwork for periodic inspection and cleaning.
IMPORTANT:
When connecting ductwork to the dryer exhaust
!duct, be sure that when screws are used they DO NOT restrict the operation (both opening and closing) of the damper.
NOTE:
When the exhaust ductwork passes through a wall, ceiling, or roof made of combustible materials, the opening must be
To protect the outside end of the horizontal ductwork from the weather, a 90° elbow bent downward should be installed where the exhaust exits the building. If the ductwork 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 the nearest obstruction (i.e., roof or ground level).
IMPORTANT:
!DO NOT use screens, louvers, or caps on the outside opening of the exhaust ductwork.
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.).
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
SINGLE DRYER VENTING
IMPORTANT:
!For exhaust duct runs over 40 feet (12.19 meters) a minimum size of
HORIZONTAL VENTING
When horizontal single
Illus. A
If the length of the duct run or quantity of elbows used exceeds the above noted specifications, the cross section area of the ductwork must be increased in proportion to the number of elbows or duct run added.
IMPORTANT:
!For extended ductwork runs, the cross section area of the duct can only be increased to an extent. For extended ductwork runs, a professional heating, ventilating, and
6 | American Dryer Corp. |