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Installation instructions
Total
DUCT FiTTiNGS
Use this
chart
to compute
maximum
permissible
lengths
for
duct
Frills
to
otltdoors.
Note: Do not exceedmaximumpermissibleequivalent
lengths!
Maximum
duct length:
100 foot for vent hoods.
Hexible
ducting:
]if flexible
metal
ducting
is used,
all the equivalent
feet values
ill
the table
should
be doubled.
The flexible
metal
duct should
be straight
and
smooth
and
extended
as much
as possible.
Equivalent
Quantity
Equivalent
Duct
Piece
Dimensions
Length*
Used
Length
7" Round,
1 tl.
straight
(per t))ot
length)
3-1/4" x 12"
l It.
straight
(per t_)ot
length)
Q_
7" 90 ° elbow
14 f).
7" 45 ° elbow
9 fl.
_-1/4
x 12"
90 ° elbm%
15 ff.
3-1/4" x 12"
45 ° elbow
9 fl.
3-1/4" x 12"
9() ° fiat elbow
36 ft.
_
7 t/
l'Olllld
111
:-]/4
x
12"
transilion
l ft.
;-l/q
X
12"
10
/
l'O/lIld
transi/ion
l ft.
7"
l'Ol]lld
10
_-l//[
X
]2
z/
transi/ion
90 ° elbow
4 ft.
-1//[
X 12 "/ tO
I
1"1)/111(1
transi/ion
90 ° (dl:)o;_
4 ft.
7" Rotm(/
wall (ap
wi/h damp(
r
28 ft. (21 ft. x_i/ll()l[t damper)
B ....
;-J/q
X 12 '/
wall (aI} x_ill_
dmnl)( r
26fl.
19 ft. without
damper)
7" Round
roof
Cap
!}(.} ff.
Round
roof vent
24 IL
Do NOT
use flexible
I)lastic ducting,.
Note: Any homeventilation system,suchasa
ventilation hood,may interruptthe properflow of
combustionair andexhaustrequiredbyfireplaces,
gasfurnaces,gas water heatersand othernaturally
vented systems.To minheizethe chanceof interruption
of suchnaturallyventedsystems,follow the heating
equipmentmanufacturer'sguidelinesandsafety
standardssuchasthose publishedby NFPA andASHRAE.
This Hood Must Use 7" Round
Duct. R Can Transition To
3-1/4" x 12" Duct
Kit - JXDW1
Order
kitJXDWl
if your
installation
requires
horizontal
ducting
fl'om
the
top
of the
hood
through
tile
back
wall
and:
* You
have
all 8 IL ceiling
and
need
to
use
aJXCH
Series
Chimney
Covet,
or
* YOU have
a 12"cabinet
or 1 2" sot;fit
that
tile
hood
is to be mounted
beneath.
This
kit provides
a duct
transition
fl'om 7" round to 3V/' x l 0"
rectangular
fi)r throngh-the-wall
venting.
Using a smaller diameter duet size
will reduce performance
_Actual length of straight duct plus duct fitting equivalent.
Equivalent length of duct pieces are basedon actual
tests conducted by GE Evaluation Engineering and
reflect requirementsfor good venting performance
with any ventilation hood.
Total Duct Run
10
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