GE PV976NSS Manuel d'instructions télécharger pdf (Page 10)

DUCT FITTINGS

This Hood Must Use an

8" Round Duct. It Can

Transition to a

3-1/4" x 12" Duct.

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 feet.

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.

Total

Equivalent Quantity Equivalent

Duct Piece Dimensions Length* Used Length

8" Round, 1 ft.

straight (per foot

length)

3-1/4" x 12" 1 ft.

straight (per foot

length)

8" 90° elbow

17 ft.

8" 45° elbow

10 ft.

3-1⁄4" x 12"

90° elbow 43 ft.

3-1/4" x 12"

45° elbow 26 ft.

3-1/4" x 12"

90° flat elbow 102 ft.

8" round to

3-1/4" x 12" transition 2 ft.

3-1/4" x 12" to 7"

round transition 5 ft.

8" round

to 3-1/4" x 12"

transition 90° elbow 6 ft.

3-1/4" x 12" to 8" round

round transition 90° elbow 13 ft.

8" Round

wall cap

with damper 32 ft.

3-1/4" x 12" wall cap

with damper 75 ft.

8" Round

roof cap 44 ft.

Round

roof vent 24 ft.

Installation Preparation

Total Duct Run

*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.

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