GE CV936 Owner's Manual & Installation Instructions page 10

Installation instructions
DUCT FiTTiNGS
Use this chart to compute maximum
permissible lengths for duct runs to
Outdoors.
Note: Donot exceedmaximumpermissibleequivalent
lengths!
Maximum duct length:
100 foot for vent hoods•
Flexible ducting:
If flexible metal ducting is used,
all the equivalent feet values in
the ruble should be doubled.
The flexible metal duct should
be straight and smooth and
extended as much as possible.
Do NOT use flexible plastic ducting.
Note: Any homeventilation system,suchasa
ventilation hood,may interruptthe properflow of
combustionair and exhaustrequiredbyfireplaces,
gas furnaces,gas water heatersand othernaturally
vented systems.To minimizethe chanceof interruption
of suchnaturallyventedsystems,follow the heating
equipmentmanufacturer'sguidelinesandsafety
standardssuchasthose publishedby NFPA andASHRAE.
Duct Piece Dimensions
7" Round, straight
• -1/4 x 12"
straight
7" 90 ° elb(m
7" 45 ° elbox_
• -1/4 x 12"
90 ° elbo_
• -1/4 x 12"
45 ° elb o_,_
:_ p*
• -I/4 x 12"
90 ° fiat elbo_
Total
Equivalent Quandty Equivalent
Length* Used Length
ltt.
(per %ot
length)
lit.
(per foot
length)
14it.
9it.
15 ft.
9it.
36fl.
@_11_ 7 p' i'Ot/lld to
p,
• -1/4 x12"
transition
• -1/4 xl2"to / rmnd
transition
lit.
lit.
This Hood Must Use 7" Round
Duct. It Can Transition To
3=1/4 ,, × 12" Duct
Kit - JXDWI
Order ldtJXDW1 if your installation
requires horizontal ducfing f)om the
top of the hood through the back
wall and:
* You have an 8 fk. ceiling and need to
use aJXCH Series Chimney Corm; or
* You have a 12"cabinet or 12" soflit
that the hood is to be mounted
beneath.
This ldt provides a duct transition
f}'oIIl 7** rotlnd to 31/4 " X 10"
rectangular for through-the-wall
venting.
Using a smaller diameter duct size
will reduce performance
7 p* I'Ot/lld to
•-1/4 x 12"
transition 90 ° elb(m
• -1/4 x12 t_ / rmnd
transition 90 ° elb(m
7" Round
wall cap
with damper
• -1/4 x 12"
_all cap _ith
damper
4it.
4it.
28 it. (21 it. x_ithout damper)
26 it. (19 it. x_ithout damper)
7" Round
roof cap 39 fk
Round
roof vent 24 ft.
*Actual length of straight duct plus duct fitting equivalent.
Equivalentlength 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