GE PVB94, PVB98, PVB37, PVB67 Duct Fittings, Flexible ducting, Installation Preparation

Installation Preparation

DUCT FITTINGS

Use 3-1/4" x 10" duct. It can transition to 6" round.

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

NOTE: Do not exceed maximum permissible equivalent lengths!

Downdraft Vent: 150' maximum equivalent length

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 cooktop with a downdraft exhaust mechanism, 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
		1 ft.
	6" round,	(per foot
	straight	length)
		1 ft.
	3-1⁄4" x 10"	(per foot
	straight	length)
	6"
	90° elbow	12 ft.
	6"
	45° elbow	7 ft.
	3-1⁄4" x 10"
	90° elbow	14 ft.
	3-1⁄4" x 10"
	45° elbow	8 ft.
	3-1⁄4" x 10"
	90° flat elbow	33 ft.
	6" round
	to 3-1⁄4" x 10"
	transition	2 ft.
	3-1⁄4" x 10"
	round to 6"
	transition	2 ft.
	6" round to
	3-1⁄4" x 10"
	transition
	90° elbow	4 ft.
	3-1⁄4" x 10" to 6"
	round transition
	90° elbow	4 ft.
	6" round
	wall cap
	with damper	24 ft.
	3-1⁄4" x 10"
	wall cap
	with damper	24 ft.
	6" round
	roof cap	33 ft.

*Actual length of straight duct plus duct fitting	Total Duct Run
equivalent. Equivalent length of duct pieces is based
on actual tests conducted by GE Evaluation Engineering
and reflect requirements for good venting performance
with any downdraft cooktop.

10