Installation Instructions

DUCTWORK CALCULATIONS

Calculate Total Equivalent Ductwork Length

 

Equivalent

Number

Equivalent

Duct Pieces

Length* x

Used =

Length

6round

 

 

 

 

 

straight

1 ft.

x

(

)=

ft.

314x 10

 

 

 

 

 

straight

1 ft.

x

(

)=

ft.

6, 90°

 

 

 

 

 

elbow

15 ft.

x

(

) =

ft.

6, 45°

 

 

 

 

 

elbow

9 ft.

x

(

) =

ft.

24max.

 

 

 

 

 

Flexible

 

 

 

 

 

Metal Offset

 

 

 

 

 

Adapter

34 ft.

x

(

) =

ft.

314x 10

 

 

 

 

 

90° elbow

16 ft.

x

(

) =

ft.

314x 10

 

 

 

 

 

45° elbow

5 ft.

x

(

) =

ft.

314x 10

 

 

 

 

 

90° flat elbow

18 ft.

x

(

) =

ft.

6round

 

 

 

 

 

to 314x 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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6round

 

 

 

 

 

 

 

 

 

 

 

 

 

to 314x 10

 

 

 

 

 

 

 

 

 

 

 

 

 

transition

 

 

 

 

 

 

 

 

 

 

 

 

 

90° elbow

20 ft.

x

(

) =

ft.

 

 

 

 

 

 

 

 

314x 10

 

 

 

 

 

 

 

 

 

 

 

 

 

to 6round

 

 

 

 

 

 

 

 

 

 

 

 

 

transition

5 ft.

x

(

) =

ft.

 

 

 

 

 

 

 

 

314x 10

 

 

 

 

 

 

 

 

 

 

 

 

 

to 6round

 

 

 

 

 

 

 

 

 

 

 

 

 

transition

 

 

 

 

 

 

 

 

 

 

 

 

 

90° elbow

12 ft.

x

(

) =

ft.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6round

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

wall cap

 

 

 

 

 

 

 

 

 

 

 

 

 

with damper

21 ft.

x

(

) =

ft.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

314x 10

 

 

 

 

 

 

 

 

 

 

 

 

 

wall cap

 

 

 

 

 

 

 

 

 

 

 

 

 

with damper

27 ft.

x

(

) =

ft.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6round

 

 

 

 

 

 

 

 

 

 

 

 

 

roof cap

20 ft.

x

(

) =

ft.

 

 

 

 

 

 

 

 

6round

 

 

 

 

 

 

 

 

 

 

 

 

 

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 JGP990 manual Ductwork Calculations, Should not exceed 100 feet equivalent length, Do not use flexible plastic ducting

JGP990 specifications

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