When single 8-inch (20.32 cm) vertical venting is used (refer to the illustration below), the ductwork from the dryer to the outside outlet cannot exceed 35 feet (10.67 meters) in total length. This calculation of 35 feet (10.67 meters) compensates or allows for the use of a maximum of three (3) elbows including the 180º (turned downward) outside outlet.
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