STEP 2:

PREPARE THE VENTING S YSYTEM

STANDARD FITTINGS

NOTE: If the existing duct is round, you must use a rectangular-to-round adapter, with a rectangular 3" extension duct installed between the damper assembly and the adapter to prevent the exhaust damper sticking.

DUCT LENGTH

The total length of the duct system, including straight duct, elbows, transitions, wall or roof caps must not exceed the equivalent of 140 feet.

For best performance, do not use more than three 90 degree elbows.

Below are the standard fittings and their equivalent length in feet.

3 1/4" x 10" to 6" =Sft.

3 1/4" x 10" roof cap = 24 ft

3 1/4" x 10" 90° elbow = 25 ft

"I-

 

90°elbow = 10 ft

3 1/4" x 10" wall cap

45°elbow = 5 ft

3 1/4" x 10" flat elbow

 

= 40 ft

 

= lOft

 

 

 

Figure 9

To calculate the equivalent length of each duct piece used, see the examples below.

 

For 3 1/4" x 10" SYSTEMS

 

Exam

)les

For 6" ROUND SYSTEMS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90° elbows _

6ft.

 

 

3-1/4"x10"

_

6ft. _

wall cap

 

 

 

 

 

 

90 °elbow _'_-2ft.

 

I _"

 

 

transi_

wall cap

 

H--L

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1-3 114" x 10"

90 ° elbow

=

25

ft.

1-transition

=

5 ft.

1-Wall

Cap

 

 

=

40

ft.

2-90 ° elbows

=

20

ft.

 

 

1-Wall

Cap

=

40

ft.

8 feet

straight

duct

 

=

8 ft.

 

8 feet

straight

=

8

ft.

TOTAL

LENGTH

 

=

73

ft.

 

TOTAL

LENGTH

=

73

ft.

 

 

 

 

 

 

 

Page 9
Image 9
Kenmore 721.80404, 721.80524, 721.80403 Standard Fittings, For 3 1/4 x 10 Systems, Les For 6 Round Systems, Transition

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