X 10 ″ ) duct elements – GE JN327 EN User Manual
Page 6
Models JV337, JV347
Model JV347 ducted installation: Use the reusable
metal grease filter (WB02X8391). Remove the baffle
from the top of the hood. Re-install the baffle so the
short side marked “VENTED” is visible. The long side
of the baffle should be inside the hood.
The hood has been designed to mate with a standard
3
1
⁄
4
″
x 10
″
rectangular or 7
″
diameter round duct.
Rectangular Duct See Figs. 5, 6 & 10: The exhaust outlet
can be installed as either the top or rear by removing the
desired rectangular knockout. A rectangular damper is
supplied with the hood.
Round Duct See Figs. 4 & 9: If round duct is desired,
either of the following methods must be used:
1. Install a 4
″
minimum length of rectangular duct
between the hood and adapter to obtain proper
operating of the outlet damper, or
2. Remove the round knockout on the top of the hood.
Drill an appropriate size hole in each of the three tabs.
Using pliers, bend the three tabs perpendicular to the
hood top. Insert the first piece of 7
″
diameter duct so
the tabs are outside of the duct. Mark on the duct the
locations of the holes in the tabs. Drill the appropriate
size hole and, using screws, fasten the duct.
MAXIMUM DUCT LENGTH: For satisfactory air
movement (CFM) the total duct length should not exceed
65 equivalent feet of 3
1
⁄
4
″
x 10
″
rectangular duct. Equivalent
feet are defined as total feet straight duct plus equivalent feet
of elbows, transitions, wall caps, etc. Figure 7a shows the
approximate equivalent feet of some typical round (6
″
dia.)
duct elements and rectangular (3
1
⁄
4
″
x 10
″
) duct elements.
Total
Equivalent
Number Equivalent
Duct Pieces
Length
Used
Length
6
″
round,
straight
5
feet
3
1
⁄
4
″
x 10
″
straight
2.5
feet
6
″
90
° elbow
8
6
″
45
° elbow
6.5
3
1
⁄
4
″
x 10
″
90° elbow
8.5
3
1
⁄
4
″
x 10
″
45° elbow
7
3
1
⁄
4
″
x 10
″
90° flat elbow
24
6
″
round
to 3
1
⁄
4
″
x 10
″
transition
5.5
3
1
⁄
4
″
x 10
″
to 6
″
round
transition
4.5
6
″
round to
3
1
⁄
4
″
x 10
″
transition
90° elbow
14.5
3
1
⁄
4
″
x 10
″
to
6
″
round
transition
90° elbow
11.5
6
″
round
34
wall cap
6 w/o
with damper
damper
3
1
⁄
4
″
x 10
″
45
wall cap
7 w/o
with damper
damper
6
″
round
roof cap
30
CAUTION: If rear or horizontal exhaust is to be
used, care should be taken to align exhaust with
space between 2 studs, or wall should be prepared at
the time it is constructed, by leaving enough space
between wall studs to accommodate exhaust.
6
Flush or recessed bottom cabinet
Flush or recessed bottom cabinet
Cabinet
flush with
top of
opening
in wall.
Cutout for rear
exhaust
FIGURE 5
FIGURE 6
5
1
⁄
4
″
3
7
⁄
8
″
3
⁄
8
″
5
1
⁄
4
″
5
1
⁄
4
″
4
″
5
1
⁄
4
″
Flush or recessed bottom cabinet
FIGURE 4
5
1
⁄
4
″
7
″
dia.
duct
cutout
Center
line
Center line
Center line
Cutout
for top
exhaust
* To order call: your local GE dealer, GE Service & Parts
Center (see the telephone white pages) or the GE Answer
Center, 1-800-626-2000.
FIGURE 7a
Equivalent length in feet
0
25
50
75
100
125
200
150
100
50
0
FIGURE 7b
Air volume in CFM
6
″
Dia.
3
1
⁄
4
″
x 10
″