Installation Instructions

DUCT FITTINGS

Use this chart to compute maximum permissable lengths for duct runs to outdoors.

Note: Do not exceed maximum permissable equivalent lengths!

Maximum duct length: 100 foot for vent hoods.

Flexible ducting:

If flexible metal ducting is used, all the equivalent feet values in the table should be doubled. The flexible metal duct should be straight and smooth and extended as much as possible.

Do NOT use flexible ducting.

Note: Any home ventilation system, such as a ventilation hood, may interrupt the proper flow of combustion air and exhaust required by fireplaces, gas furnaces, gas water heaters and other naturally vented systems. To minimize the chance of interruption of such naturally vented systems, follow the heating equipment manufacturer’s guidelines and safety standards such as those published by NFPA and ASHRAE.

Using a smaller diameter duct size will reduce performance

 

 

 

Total

 

Equivalent

Quantity

Equivalent

Duct Piece Dimensions

Length*

Used

Length

 

1 ft.

 

 

Round,

(per foot

 

 

straight

length

 

 

 

1 ft.

 

 

3¼” x 12”

(per foot

 

 

straight

length

 

 

90° elbow

8 ft.

 

 

45° elbow

6 ft.

 

 

3¼” x 12” or

15 ft.

 

 

90° elbow

 

 

3¼” x 12” or

9 ft.

 

 

45° elbow

 

 

3¼” x 12” or

20 ft.

 

 

90° flat elbow

 

 

7” round to

 

 

 

3¼” x 12”

1 ft.

 

 

transition

 

 

3¼” x 12” to 7” round

5 ft.

 

 

transition

 

 

7” round to

 

 

 

3¼” x 12”

5 ft.

 

 

transition 90° elbow

 

 

3¼” x 12” to7” round

15 ft.

 

 

transition 90° elbow

 

 

Round

 

 

 

wall cap

30 ft.

 

 

with damper

 

 

3¼” x 12”

 

 

 

wall cap with

30 ft.

 

 

damper

 

 

7” round

30 ft.

 

 

roof cap

 

 

Round

24 ft.

 

 

roof vent

 

 

1 Ft = 0.3 m 1” = 2.5 cm

*Actual length of straight duct plus duct fitting

 

equivalent. Equivalent length of duct pieces are

 

based on actual tests conducted by GE Evaluation

 

Engineering and reflect requirements for good

 

venting performance with any ventilation hood.

Total Duct Run

9

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GE PVWS936, PVWT936, PVWS930, PVWG936, PVIG940 installation instructions Duct Fittings, Flexible ducting

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