American Dryer Corp. MDG-50 - Manual (Page 18)

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If the length of the duct run or quantity of elbows used exceeds the above noted specifications, the cross section
area of the duct work must be increased in proportion to the number of elbows or duct run added.
IMPORTANT: For extended duct work runs, the cross section area of the duct can only be increased
to an extent. For extended duct work runs, a professional HVAC firm should be
consulted for proper venting information.
V
ERTICAL
V
ENTING
When vertical single 10-inch venting is used (refer to Illus. B below), the duct work from the dryer to the outside
outlet cannot exceed 60 feet (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