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GE JGP979 Owner's Manual page 25

Gas downdraft cooktop
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Installation
Instructions
DUCT LENGTH CHART
Duct
Fitting
Number
Total
Equivalent
Duct
Fitting
Equivalent
Length
of Fittings
Length
of Fitting
8" Diameter
90 ° Elbow
5 ft.
(1.52 m)
6" Diameter
45 ° Elbow
2.5
ft.
(0.76 m)
\',
5" to 6" Transition
1 ft.
_Air
Flow
(12.7 cm to 15.24 cm)
(0.30 m)
Air Flow this direction
not recommended.
6"to 31/4"x 10"90 ° Elbow
5 ft.
(15.24 cm to 8.26 cm x 25.4 cm)
(1.52 m)
Air Flow
_
3W'xlO"to6"90°Elbow
9ft,
(8.26 cm x 25.4 cm to 15.24 cm)
(2.75 m)
Air Flow
Air Flow
6" to 31/4 " X 10" Transition
1 ft.
(15.24 cm to 8.26 cm x 25.4 cm)
(0.30 m)
31_"x 10"to
6"Transition
4.5 ft.
(8.26 cm x 25.4 cm to 15.24 cm)
(1.37 m)
Air Flow
_Air
Flow
5" to 31/4 ", X 10" 90 ° Elbow
6 ft.
(12.7 cm to 8.26 cm x 25.4 cm)
(1.83 m)
Air Flow this direction
not recommended.
31/4"X 10"90 ° Elbow
5 ft.
(8.26 cm x 25.4 cm)
(1.52 m)
31/4"x 10" Flat Elbow
12 ft,
(8.26 cm x 25.4 cm)
(3.66 m)
6" Wall Cap
28 ft.
(15.24 cm)
(8.53 m)
31/4"x 10" Wall Cap
20 ft.
(8.26 cm x 25.4 cm)
(6.10 m)
10"x 10" Roof Jack
0 ft.
(25.4 cm x 25.4 cm)
(0 m)
Thermal
Break
2 ft.
(0.61 m)
6" Diameter
Straight
Duct-Feet
1 ft.
(For flex duct multiply
by 2.)
(0.30 m)
31_" x 10" Straight
Duct-Feet
1 ft.
(0.30 m)
System
Total
25

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