American Dryer AD-202 Installation Manual page 25

Horizontal Venting:
When single dryer horizontal venting is used, the length of ductwork from the dryer to the outside exhaust
outlet must not exceed 45 feet (13.71 meters). For the 202, the minimum diameter of this ductwork must
be at least 20-inches (50.8 cm), for the 202 (AGA) 18-inches (45.7 cm), and for the 202DR 12-inches
(30.4 cm). The shape of the ductwork is not critical as long as the minimum cross-sectional area is
provided. It is suggested that the use of 90° turns be avoided; use 30° and/or 45° angles instead. The
radius of the elbows should preferably be 1-1/2 times the diameter of the duct. No more than one (1)
elbow must be used including the elbow used for outside protection from the weather. If more than one
(1) elbow is needed, the cross-sectional area must be increased. When adding ducts, the duct to be added
should overlap the duct to which it is to be connected. ALL ductwork should be smooth inside with no
projections from sheet metal screws or other obstructions, which will collect lint. ALL ductwork joints
must be taped to prevent moisture and lint from escaping into the building. Inspection doors should be
installed at strategic points in the exhaust ductwork for periodic inspection and cleaning of lint from the
ductwork.
Vertical Venting:
When single dryer vertical venting is used, the length of ductwork from the dryer to the outside exhaust
outlet must not exceed 30 feet (9.14 meters). For the 202, the minimum diameter of this ductwork must
be at least 24-inches (60.96 cm) (even though the dryer exhaust duct is only 20-inches [50.8 cm]), for the
202 (AGA) 18-inches (45.7 cm), and for the 202DR 12-inches (30.4 cm). The shape of the ductwork is not
critical as long as the minimum cross-sectional area is provided. It is suggested that the use of 90° turns be
avoided; use 30° and/or 45° angles instead. The radius of the elbows should preferably be 1-1/2 times
the diameter of the duct. No more than three (3) elbows must be used, including the two (2) elbows
(gooseneck) used for outside protection from the weather. If more than three (3) elbows are needed, the
cross-sectional area must be increased. When adding ducts, the duct to be added should overlap the duct
to which it is to be connected. ALL ductwork should be smooth inside with no projections from sheet
metal screws or other obstructions, which will collect lint. ALL ductwork joints must be taped to prevent
moisture and lint from escaping into the building. Inspection doors should be installed at strategic points in
the exhaust ductwork for periodic inspection and cleaning of lint from the ductwork.
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