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2. Single Dryer Venting
Where possible, it is suggested that a separate exhaust duct be provided for each dryer. The exhaust duct
work should be laid out in such a way that the duct work travels as directly as possible to the outdoors with as
few turns as possible. It is suggested that the use of 90º turns in ducting be avoided; use 30º or 45º angles
instead. The shape of the exhaust duct work 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
should not exceed 0.3 inches water column.
If the length of the duct work run or quantity of elbows used exceeds the specifications noted in this manual,
the cross-sectional area of the duct work 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 duct work runs...or where numerous elbows are used, the cross-
sectional area can only be increased to an extent and a professional 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 DIAMETER EXHAUST DUCT!!!
Where independent exhaust ducting is used for each basket (tumbler), the connection size at the point where
the internal ducting (6-inch diameter) leaves the dryer, the minimum size connection is 8-inch diameter (54
square inches cross-sectional area)...and this is only true providing;
(Refer to illustration [MAN2114] on page 16 for details.)
1) The maximum duct run is no more than 20 feet.
2) The duct work 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 six (6) inches 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 diameter (54 square inches cross-
sectional area).