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3.
Single Dryer Venting
When possible, it is suggested that a separate exhaust duct be provided for each dryer. The exhaust
ductwork should be laid out in such a way that the ductwork travels as directly as possible to the outdoors
with as few turns as possible. It is suggested that the use of 90º turns be avoided; use 30º or 45º angles
instead. The shape of the exhaust ductwork is not critical so long as the minimum cross-sectional area is
provided.
IMPORTANT: 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.).
If the length of the ductwork run or quantity of elbows used exceeds the specifications noted in this manual,
the cross-sectional area of the ductwork must be increased in proportion to the number of elbows or duct
run added.
a. Single Dryer Venting - with each basket (tumbler) independently vented
ALL the way to the outdoors.
IMPORTANT: For extended ductwork runs or where numerous elbows are used, the cross-sectional
area can only be increased to an extent and a professional heating, venting, and air
conditioning (HVAC) firm should be consulted for proper venting information.
IMPORTANT: UNDER NO CIRCUMSTANCES can the dryer be vented to the outdoors using a
6-inch (15.24 cm) diameter exhaust duct!!!
When independent exhaust ducting is used for each basket (tumbler), the connection size at the point
where the internal ducting (6-inch [15.24 cm] diameter) leaves the dryer, the minimum size connection
is 8-inches (20.32 cm) in diameter (54 square inches [348.4 square centimeters] cross-sectional area)
and this is only true providing: (Refer to the illustration on page 17 for details.)
1) The maximum duct run is no more than 15 feet (4.6 meters).
2) The ductwork is on a horizontal run (no riser).
3) There is no more than one (1) elbow, which includes the outside outlet (i.e., elbow used for outside
protection).
IMPORTANT: Even though the dryer’s exhaust outlet size is 6-inches (15.24 cm) in diameter (at both
the top basket [tumbler] elbow where it leaves the dryer), the minimum connection at
this point of exit from the dryer is 8-inches (20.32 cm) in diameter (54 square inches
[348.4 square centimeters] cross-sectional area).