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American Dryer Corp.

112217 - 4

NOTE 1

Opening from combustible materials must be 2-inches (5.08 cm)
larger than the duct (all the way around). The duct must be centered
within this opening.

NOTE 2

Distance should be 2 times the diameter of the duct to the nearest
obstruction.

A = 6-inches (15.24 cm)
B = 12 feet (3.66 meters)

NUMBER OF DRYERS

MINIMUM CROSS-

SECTIONAL AREA

SQ IN

164

120

SQ CM

1058

774.2

516.1

348.4

MINIMUM ROUND
DUCT DIAMETER

35.56

30.48

25.4

20.32

NOTE 1

Opening from combustible materials must be 2-inches (5.08 cm)
larger than the duct (all the way around). The duct must be centered
within this opening.

NOTE 2

Distance should be 2 times the diameter of the duct to the nearest
obstruction.

A = 12 feet (3.66 meters)

B = 8-inches (20.32 cm)

The length of the ductwork from the dryer to the outside
exhaust outlet, must not exceed 12 feet (3.66 meters).

The

minimum diameter of this ductwork must be at least
8-inches (20.32 cm) even though the dryer exhaust duct
connection is smaller

. Including tumbler/dryer elbow

connections or elbows used for outside protection from the
weather, no more than 4 90° elbows should be used in the
exhaust duct run. If more than the equivalent of four 90°
elbows are used, the cross-sectional area of the ductwork
must be increased.

Multiple Dryer (Common) Venting

IMPORTANT:

For extended ductwork runs, the cross-

sectional area of the ductwork can only be increased to an
extent. When the ductwork approaches the maximum
limits as noted in this manual, a professional HVAC firm
should be consulted for proper venting information.

If it is not feasible to provide separate exhaust ducts for
each dryer, ducts from individual dryers may be channeled
into a “common main duct.” The individual ducts should
enter the bottom or side of the main duct at an angle not
more than 45º in the direction of airflow. The main duct
should be tapered, with the diameter increasing before each
individual duct is added. The minimum diameter of the
individual ductwork must be at least 8-inches (20.32 cm).

IMPORTANT:

No more than four dryers should be

connected to one main common duct.

The illustration below shows the minimum cross-sectional
area for multiple dryer round or square venting. These
figures must be increased if the main duct run from the last
dryer to where it exhausts to the outdoors is longer than 12
feet (3.66 meters) or has more than 1 elbow in it.

Multiple Dryer Venting with 6-Inch (15.24 cm) Diameter

440 cfm (12.46 cmm) Exhaust Connections at Common Duct

NOTE:

When the exhaust ductwork passes through a wall,

ceiling, or roof made of combustible materials, the
opening must be 2-inches (5.08 cm) larger than the duct
(all the way around). The duct must be centered within
this opening.
As per the National Fuel Gas Code, “Exhaust ducts for
type 2 clothes dryers shall be constructed of sheet metal
or other noncombustible material. Such ducts shall be
equivalent in strength and corrosion resistance to ducts
made of galvanized sheet steel not less than 26 gauge
(0.0195-inches [0.50 mm]) thick.”

The ductwork for this appliance must be suitable for the
appliance category in accordance with national installation
regulations of the country of destination.

Outside Ductwork Protection

To protect the outside end of the horizontal ductwork from
the weather, a 90° elbow bent downward should be installed
where the exhaust exits the building. If the ductwork travels
vertically up through the roof, it should be protected from the
weather by using a 180° turn to point the opening downward.
In either case, allow at least twice the diameter of the duct
between the duct opening and the nearest obstruction (refer
to the diagram).

IMPORTANT:

Do not use screens, louvers, or caps on the

outside opening of the exhaust ductwork.

Single Dryer Venting

IMPORTANT:

For extended ductwork runs, the cross-