American Dryer Corp. AD-60 - Manual (Page 18)

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VERTICAL VENTING
For vertical single venting, a minimum of 10-inch (25.4 cm) venting must be used (refer to Illus. B below). The
ductwork from the dryer to the outside outlet cannot exceed 60 feet (18.29 meters) refer to Illus. B below.
This calculation compensates for the use of a maximum of three (3) elbows including the two (2) elbows
creating the 180° (turned downward) outside outlet.
Illus. B
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.