American Dryer Corp. AD-60 - Manual (Page 17)

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SINGLE DRYER VENTING
IMPORTANT: For exhaust duct runs over 30 feet (9.14 meters) or if additional elbows are used; a
minimum size of 10-inch (25.4 cm) duct must be used.
HORIZONTAL VENTING
For horizontal single venting, an 8-inch (20.32 cm) minimum duct must be used, the ductwork to the outlet
cannot exceed 30 feet (9.14 meters) refer to Illus. A below. This calculation of 30 feet (9.14 meters) compensates
or allows for the use of a maximum of only one (1) elbow (which is the outside outlet protection).
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, venting, and air
conditioning (HVAC) firm should be consulted for proper venting information.