GE JGP985 User Manual download pdf (Page 25)

Installation Instructions

DUCTWORK CALCULATIONS

Calculate Total Equivalent Ductwork Length

Equivalent Number Equivalent

Duct Pieces Length* x Used = Length

6″ round

straight 1 ft. x ( )

†

= ft.

⁄4″ x 10″

straight 1 ft. x ( )

†

= ft.

6″, 90°

elbow 15 ft. x ( ) = ft.

6″, 45°

elbow 9 ft. x ( ) = ft.

24″ max.

Flexible

Metal Offset

Adapter 34 ft. x ( ) = ft.

⁄4″ x 10″

90° elbow 16 ft. x ( ) = ft.

⁄4″ x 10″

45° elbow 5 ft. x ( ) = ft.

⁄4″ x 10″

90° flat elbow 18 ft. x ( ) = ft.

6″ round

to 3

⁄4″ x 10″

transition 7 ft. x ( ) = ft.

Subtotal Column 1 = ft.

*Equivalent lengths of duct pieces are based on

actual tests and reflect requirements for good venting

performance with any downdraft cooktop.

† Measure and list feet of straight duct used. Count

and list the quantity of all other duct pieces for the

“Number Used” of each type.

IMPORTANT

For maximum efficiency, use the shortest and

straightest duct run possible, with as few fittings as

possible. For satisfactory performance, the duct run

should not exceed 100 feet equivalent length.

Venting performance is improved by using larger

diameter duct.

Equivalent Number Equivalent

Duct Pieces Length* x Used = Length

6″ round

to 3

⁄4″ x 10″

transition

90° elbow 20 ft. x ( ) = ft.

⁄4″ x 10″

to 6″ round

transition 5 ft. x ( ) = ft.

⁄4″ x 10″

to 6″ round

transition

90° elbow 12 ft. x ( ) = ft.

6″ round

wall cap

with damper 21 ft. x ( ) = ft.

⁄4″ x 10″

wall cap

with damper 27 ft. x ( ) = ft.

6″ round

roof cap 20 ft. x ( ) = ft.

6″ round

roof vent 24 ft. x ( ) = ft.

Subtotal Column 2 = ft.

Subtotal Column 1 = ft.

TOTAL DUCTWORK = ft.

Should not exceed 100 feet.

DO NOT use flexible plastic ducting.

Vent installation should not exceed 100 feet

equivalent length.

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GE JGP985 User Manual Page 25

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