FACILITIES REQUIRED

To assure compliance, consult local building code requirements.

WARNING

A drying tumbler produces combustible lint. To reduce the risk of fire, the tumbler must be exhausted to the outdoors.

W057

FLOOR

The tumbler must be installed on a level floor capable of supporting 100 pounds per square foot (488.3 kg/sq. m). Floor covering materials such as carpeting or tile must be removed.

LAYOUT

Whenever possible, tumblers should be installed along an outside wall where duct length can be kept to a minimum, and make-up air can be easily accessed. Construction must not block the airflow at the top rear of the tumbler. Doing so would prevent adequate air supply to the tumbler’s combustion chamber.

VENTING

For maximum efficiency and minimum lint accumulation, tumbler air must be exhausted to the outdoors by the shortest possible route.

Proper sized exhaust ducts are essential for proper operation. All elbows should be sweep type. Exhaust ducts must be assembled so the interior surfaces are smooth, so the joints do not permit the accumulation of lint. Do not use sheet metal screws to join vent sections. Improperly sized or assembled ductwork causes excess back pressure which results in slow drying, lint collecting in the duct, lint blowing back into the room, and increased fire hazard.

Exhaust ducts shall be constructed of sheet metal or other noncombustible material. Such ducts must be equivalent in strength and corrosion resistance to ducts made of galvanized sheet steel not less than 0.0195 inches (0.495 mm) thick.

Where the exhaust duct pierces a combustible wall or ceiling, an opening having a diameter of 4 inches (10.2 cm) larger than the diameter of the exhaust duct shall be provided, with the duct centered in the opening. When ducts pass through walls, ceilings, floors or partitions, the space around the duct shall be sealed with non- combustible material. Refer to Figures 3, 4 and 5.

•Individual Venting

For maximum efficiency and performance, it is

preferred to exhaust tumbler(s) individually to the outdoors. At no point may the cross area of installed venting be less than the cross area of the exhaust thimble of the tumbler.

The maximum allowable length venting is 14 feet (4.3

m)and two 90° elbows or equivalent. If the equivalent length of a duct required for an installation exceeds the maximum allowable equivalent length, the diameter of a round duct must be increased by 10% for each additional 20 feet (6.1 m). Cross section area of a rectangular duct must be increased by 20% for each addtional 20 feet (6.1 m). To determine equivalent venting, Refer to Table 1.

 

DUCTEQUIVALENT LENGTH OF
DIAMETERSTRAIGHT DUCT

 

 

 

 

6"

(15.2 cm)

One 90° elbow = 7 feet (2.1 m)

8"

(20.3 cm)

One 90° elbow = 9.3 feet (2.83 m)

10"

(25.40 cm)

One 90° elbow = 11.6 feet (3.5 m)

12"

(30.48 cm)

One 90° elbow = 14 feet (4.3 m)

14"

(35.56 cm)

One 90° elbow = 16 feet (4.9 m)

16"

(40.64 cm)

One 90° elbow = 18.7 feet (5.7 m)

18"

(45.72 cm)

One 90° elbow = 21 feet (6.4 m)

 

 

 

 

Equivalent Length (feet) = 1.7 x Duct Diameter (inches)

Table 1

Example: A 12" diameter duct’s equivalent length of 14 feet of duct and two 90° elbows is: Equivalent Length = 14 feet + (2) 90° elbows

=14 feet + 14 feet + 14 feet=42 feet (12.8 m)

With the tumbler in operation, airflow at any point in the duct must be at least 1200 feet per minute (366 m./ min.) to insure that the lint remains airborne.

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