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9
Vertical Venting
When vertical single 8-inch (20.32 cm) venting is used (refer
to Illus. B below), the ductwork from the dryer to the outside
outlet cannot exceed 55 feet (16.7 meters). 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-sectional area of
the ductwork must be increased in proportion to the number
of elbows or duct run added.
Important
Do not use screens, louvers, or caps on the
outside opening of the exhaust ductwork.
Exhaust back pressure measured by a manometer at the
dryer exhaust duct area must be no less than 0 and must
not exceed 0.3 inches (0.74 mb) of water column (W.C.).
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, ventilating, and
air-conditioning (HVAC) firm should be consulted for
proper venting information.
Single Dryer Venting
Important
For exhaust duct runs over 85 feet (25.9 meters) a
minimum size of 10-inches (25.4 cm) must be
used.
Horizontal Venting
When a single 8-inch (20.32 cm) horizontal vent is used, the
ductwork to the outlet cannot exceed 85 feet (25.9 meters),
refer to Illus. A below. This calculation of 85 feet (25.9 meters)
compensates or allows for the use of a maximum of only one
(1) elbow, (which is the outside outlet protection).
Illus. A
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