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If the length of the duct run or quantity of elbows used exceeds the above noted specifications, the cross-
sectional 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-sectional 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.
VERTICAL VENTING
When vertical single 10-inch (25 cm) venting is used (refer to Illus. B below), the duct work from the dryer to
the outside outlet
cannot exceed 40 feet (12 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