GE Monogram JGP645 Duct Fittings, Flexible ducting, Do not use flexible plastic ducting

INSTALLATION INSTRUCTIONS

(continued)

DUCT FITTINGS

Use the chart at the right 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.

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.

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			Total
	Equivalent	Number	Equivalent
Duct Pieces	Length*	Used	Length

		6″ round,	1 ft.
			(per foot
		straight	length)		feet
		31⁄4″ x 10″	1 ft.
			(per foot
		straight	length)		feet
		6″, 90°	15	ft.
		elbow
		6″, 45°	9 ft.
		elbow
		31⁄4″ x 10″	16	ft.
		90° elbow
		31⁄4″ x 10″	5 ft.
		45° elbow
		31⁄4″ x 10″	18	ft.
		90° flat elbow
		6″ round
		to 31⁄4″ x 10″	7 ft.
		transition
		31⁄4″ x 10″
		to 6″ round	5 ft.
		transition
		6″ round
		to 31⁄4″ x 10″
		transition	20	ft.
		90° elbow
		31⁄4″ x 10″
		to 6″ round
		transition	12	ft.
		90° elbow
		6″ round wall	21	ft.
cap with damper
	31⁄4″ x 10″ wall		27	ft.
cap with damper
		6″ round	20	ft.
		roof cap
		6″ round	24	ft.
		roof vent

Total duct run should not exceed 150 ft.

*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 downdraft cooktop.