GE Monogram ZGU365 installation instructions Duct Fittings, Gas Downdraft Cooktop

Ductwork

G a s Downdraf t Cooktop

Duct Fittings

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

Note: Do not exceed maximum permissible equivalent lengths!

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.

				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	15 ft.
	6"
	45° elbow	9 ft.
	3-1⁄4" x 10"
	90° elbow	16 ft.
	3-1⁄4" x 10"
	45° elbow	5 ft.

Do NOT use flexible
plastic ducting.	3-1⁄4" x 10"
	90° flat elbow	18 ft.

Gas Downdraft

Cooktop

Model ZGU365 150' maximum equivalent length

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 inter- ruption of such naturally vented systems, follow the heating equipment manufacturer’s guidelines and safety standards such as those published by NFPA and ASHRAE.

6" round
to 3-1⁄4" x 10"
transition	7 ft.
3-1⁄4" x 10"
round to 6"
transition	5 ft.
6" round to
31⁄4" x 10"
transition
90° elbow	20 ft.
3-1⁄4" x 10" to 6"
round transition
90° elbow	12 ft.
6" round
wall cap
with damper	21 ft.
3-1⁄4" x 10"
wall cap
with damper	27 ft.
6" round
roof cap	20 ft.
6" 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 downdraft cooktop.

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