GE JN322 EN - Manual (Page 6)

2. DUCT INSTALLATION
“B” Models: See Figs. 4 and 9.
The hood exhaust has been designed to mate with
standard 7“ round duct. (A round damper kit may be
ordered. Order GE model number JXDA22.)*
A. If a rectangular duct is desired, a round-to-rectangular
adapter must be used. Install a 4“ minimum length of
7“ round duct between the hood and adapter to obtain
proper operation of the outlet damper.
B. If 6“ round duct is desired, a 7“ to 6“ reducer is required.
Install a 4“ minimum of 7“ round duct between the hood
and reducer to obtain proper operation of the outlet damper.
Type “C” Models: See Figs. 5,6 and 10.
The hood exhaust has been designed to mate with a
standard 3!4” x 10” rectangular duct. 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
operation of the outlet damper, or
2. Cut off both comers of outlet damper at score lines.
Installation may then be made directly to
to-round adapter.
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.
MAXIMUM DUCT LENGTH: For satisfactory
air movement the total duct length should not
exceed 65 equivalent feet of 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!4”
x 10”) duct elements.
Equivalent length in feet
100 125
Total
Equivalent Number Equivalent
Duct Pieces Length Used Length
5
feet
3%’’ X1O”
straight
2.5
feet
6“,
90° elbow
8
6“
45° elbow 6.5
3%” x lo”
90° elbow
8.5
x lo”
45° elbow 7
x 1
o“
90° flat elbow 24
6“ round
to x lo”
transition
5.5
3%” x lo”
to 6“ round
transition 4.5
6“ round to
x
lo”
transition
90° elbow
14.5
3!4” x
o“
to
6“ round
transition
90° elbow 11.5
6“ round
34
wall cap 6 W/O
with damper damper
x 1
o“ 45
wall cap 7
with damper damper
6“ round
roof cap
30
I
200
------
“: 150
--- 6“ Dia.
●
To order call: your local GE dealer, GE Service& Parts
100
------
------ Center (see the telephone white pages) or the GE Answer
Center, 1-800-626-2000.
50
FIGURE 7a
FIGURE 7b
Flush or recessed bottom cabinet Flush or recessed bottom cabinet Flush or recessed bottom cabinet
FIGURE 6 5%” Cutout for rear
exhaust
6