GE ZV850 installation instructions Duct fittings, Flexible ducting

Duct fittings

Installation Preparation

		36" Island Vent Hood
Use this chart to
				Total
compute maximum		Equivalent	Quantity	Equivalent
permissable lengths	Duct Piece Dimensions	Length*	Used	Length
for duct runs to	Round,	1 ft.
outdoors.	straight	(per foot

length)

This Hood Must

Use 6" Round Duct It Can Transition to 3-1/4" x 10" or

3-1/4" x 12" Duct

Note: Do not exceed maximum permissable equivalent lengths!

Maximum duct length: 100 foot for range 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 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.

3-1⁄4" x 10"	1 ft.
straight	(per foot
	length)
90° elbow	15 ft.
45° elbow	9 ft.
3-1⁄4" x 10"
90° elbow	15 ft.
3-1⁄4" x 10"
45° elbow	9 ft.
3-1⁄4" x 10"
90° flat elbow	20 ft.
6" round to
3-1⁄4" x 10" or
3-1/4" x 12" transition	1 ft.
3-1⁄4" x 10"
to 6" round transition	5 ft.
6" round to
3-1/4" x 10"
transition 90° elbow	5 ft.
3-1⁄4" x 10" to 6" round
transition 90° elbow	15 ft.
Round
wall cap
with damper	30 ft.
3-1⁄4" x 10" wall cap
with damper	30 ft.
Round
roof cap	26 ft.
Round
roof vent	24 ft.

* Actual length of straight duct plus duct fitting	Total Duct Run
equivalent. Equivalent length of duct pieces are based
on actual tests conducted by GE Evaluation Engineer-
ing and reflect requirements for good venting
performance with any ventilation hood.

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