GE CV936 Owner's Manual And Installation Instructions page 10

Installation instructions
Total
DUCT FiTTiNGS
Use this chart to compute maximum
permissible lengths
for duct rtlns to
otltdoors.
Note: Do not exceedmaximumpermissibleequivalent
lengths!
Maximum duct length:
100feet for vent hoods.
Hexible ducting:
If flexible metal ducting is used,
all the equivalent feet values in
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, l tl.
straight (per toot
length)
3-1/4" x 12" l It.
straight (per t_ot
length)
(_ 7" 1}0° elbow 14 f).
7" 45 ° elbow 9 1"1.
5 ..... 12"
-1/4 X
90 ° ell:)m_ 15 ff.
3 -1/4" x 12"
45 ° elbow 9 tl.
3-1/4" X 12"
9{)° fiat elbow 36 ft.
_l_ 7/* 1"Ol1115/ 10
:-5/4 x IU'
transilion 1 ft.
-5//[ X 1_ [ 1 l'O/lll(]
transilion 1 ft.
7/t 1"O51115/ 10
_. 3-1/4" x 12" transi/ion 90 ° elbow 4 ft.
;-5//[ X l_ I 1 l'()tlll(I
transilion 90 ° ell:)m_ 4 ft.
7" Roun(/
wall (a 1)
wi/h daml)( r 28 ft. (21 ft. xGlhom damper)
B .....
;-5/4
X 12"
wall (ap x_i/l_
damp( r
26fl.
19 ft. without damper)
7" Round
roof cap 31.} ff.
Round
roof vent 24 IL
Do NOT use flexible IAastic ducting,.
Rote: Any homeventilation system,suchasa
ventilation hood,roayinterruptthe properflow of
combustionair andexhaustrequiredbyfireplaces,
gasfurnaces,gas water heatersand othernaturally
vented systems.To minimizethe chanceof interruption
of suchnaturallyventedsystems,follow the heating
equipmentmanufacturer'sguidelinesandsafety
standardssuchasthose publishedby NFPA andASHRAE.
This Hood Must Use 7" Round
Duct. It 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 the back
wall and:
,b You have an 8 tL ceiling and need to
use aJXCH Series Chimney Cover, or
* YOU have a 12"cabinet or 12" soLfit
that the hood is to be mounted
beneath.
This kit provides a duct transition
fl'om 7" round to 3V/' x l O"
rectangular fi)r throngh-the-wall
venting.
Using a smaller diameter duct 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 P.tm
10