Installation Preparation

DUCT FITTINGS

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

NOTE: Do not exceed maximum permissible equivalent lengths!

Maximum duct length: 100 foot for 8round duct

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 plastic 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.

This Hood Must Use an

8Round Duct.

 

 

 

 

Total

 

 

Equivalent

Quantity

Equivalent

Duct Piece

Dimensions

Length*

Used

Length

 

Round,

1 ft.

 

 

 

straight

(per foot

 

 

 

 

length)

 

 

 

3-1/4x 12

1 ft.

 

 

 

3-1/4x 24

(per foot

 

 

 

straight

length)

 

 

 

8round

 

 

 

 

90° elbow

15 ft.

 

 

 

8round

 

 

 

 

45° elbow

8 ft.

 

 

 

3-1⁄4x 12

 

 

 

 

90° elbow

11 ft.

 

 

 

3-1/4x 12or

 

 

 

 

45° elbow

6 ft.

 

 

 

3-1/4x 12

 

 

 

 

90° flat elbow

24 ft.

 

 

 

8round to

 

 

 

 

3-1/4x 12

 

 

 

 

or 3-1/4x 24transition

1 ft.

 

 

 

3-1/4x 12to 8

 

 

 

 

round transition

8 ft.

 

 

 

8round

 

 

 

 

to 3-1/4x 12or

 

 

 

 

transition 90° elbow

16 ft.

 

 

 

3-1/4x 12to 8round

 

 

 

 

round transition 90° elbow

17 ft.

 

 

 

8round

 

 

 

 

wall cap

 

 

 

 

with damper

30 ft.

 

 

 

3-1/4x 12wall cap

 

 

 

 

with damper

30 ft.

 

 

 

8round

 

 

 

 

roof cap

26 ft.

 

 

 

8round

 

 

 

 

roof vent

26 ft.

 

 

*Actual length of straight duct plus duct fitting equivalent. Equivalent length of duct pieces are

based on actual tests conducted by GE Evaluation Total Duct Run Engineering and reflect requirements for good

venting performance with any ventilation hood.

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GE ZV900 installation instructions Duct Fittings, Flexible ducting, Do not use flexible plastic ducting

ZV900 specifications

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