Exhaust Requirements
Individual Venting
For maximum efficiency and performance, it is preferred to exhaust tumbler(s) individually to the outdoors.
IMPORTANT: At no point may the cross sectional area of installed venting be less than the cross sectional area of the exhaust outlet of the tumbler.
The exhaust duct must be designed so the static back pressure measured 12 inches (305 mm) from the exhaust outlet does not exceed the maximum allowable pressure specified on the installation sticker on the rear of the tumbler. Static back pressure must be measured with the tumbler running (both pockets on stacked models).
The maximum allowable length of venting of the same diameter as the exhaust thimble 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 meters). Cross section area of a rectangular duct must be increased by 20% for each additional 20 feet (6.1 meters). Refer to Table 7 to determine equivalent venting.
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5
2
CONNECT TO TUMBLER

Duct

Equivalent Length of

Diameter

Straight Duct

 

 

8 in. (203 mm)

One 90° elbow = 9.3 ft. (2.83 m)

10 in. (254.0 mm)

One 90° elbow = 11.6 ft. (3.5 m)

12 in. (304.8 mm)

One 90° elbow = 14 ft. (4.3 m)

14 in. (355.6 mm)

One 90° elbow = 16 ft. (4.9 m)

16 in. (406.4 mm)

One 90° elbow = 18.7 ft. (5.7 m)

18 in. (457.2 mm)

One 90° elbow = 21 ft. (6.4 m)

 

 

Equivalent Length (feet) = 1.17 x Duct Diameter (inches)

Table 7

Example: A 12 inch diameter duct’s equivalent length of 14 feet of duct and two 90° elbows is:

Equivalent Length = 14 ft. + (2) 90° elbows

=14 ft. + 14 ft. + 14 ft.

=42 ft. (12.8 m)

With the tumbler in operation, airflow at any point in the duct should be at least 1200 feet per minute

(366 meters per minute) to ensure that lint remains airborne. If 1200 feet per minute cannot be maintained, schedule a regular inspection and cleaning of the ductwork.

CONNECT TO TUMBLER

EXHAUST

OUTLET

4

2

3

1

HORIZONTAL EXHAUST INSTALLATION

 

 

3

4

 

 

 

VERTICAL EXHAUST INSTALLATION

 

TMB2009N

 

 

 

 

TMB1379N

 

Consult your local building code for regulations which may also apply.

 

 

NOTE: Inside of duct shall be smooth. Do not use sheet metal screws to join sections.

 

1

No Screen or Cap

 

 

2

Wall

 

 

3

Clearance per Local Codes

 

 

4

NOTE: Where the exhaust duct pierces a combustible wall or ceiling, the opening must be sized per local codes.

5

Minimum Distance Between Opening and Roof: 36 in. (914 mm).

 

 

 

 

 

 

 

 

 

Figure 10

 

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