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VERTICAL VENTING
When vertical single 12-inch (30.48 cm) venting is used (refer to Illus. B below), the duct work from the dryer
to the outside outlet cannot exceed 25 feet (7.6 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 duct work must be increased in proportion to the number of elbows or duct run added.
IMPORTANT: Minimum duct size for a dryer that is vented horizontally is 10-inches (25.4 cm) for a
round duct (or different cross section with an area of 80 square inches [516.12 square
centimeters]).
IMPORTANT: Minimum duct size for a dryer that is vented vertically is 12-inches (30.48 cm) for a
round duct (or different cross section with an area of 115 square inches [741.93
square centimeters]).
IMPORTANT: Never reduce the duct size anywhere downstream of the dryer.
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.