GE JV936 Operating Instructions Manual page 9

Installation Instructions
DUCT FITTINGS
Use this chart to compute maximum
permissible lengths for duct runs to
outdoors.
Note: Do not exceed maximum
permissible equivalent lengths!
Maximum duct length:
100 foot for vent hoods.
Flexible 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 smoot
and extended as much as possible.
Do NOT use flexible plastic ducting.
Note: Any home ventilation system,
such as a ventilation hood, may interrupt
the proper flow of combustion air
and exhaust required by fireplaces,
gas furnaces, gas water heaters and
other naturally vented systems.To
minimize the chance of interruption of
such naturally vented systems,follow
the heating equipment manufaturer's
guidelinesand safety standards such as
those publishedby NFPA and ASHRAE.
When applicable, install any makeup
(replacement)air system in accordance
with local building code requirements.
Visit GEAppliances.comfor available
makeup air solutions.
This Hood Must Use 7" Round
Duct. It Can Transition To
3-1/4" x 12" Duct.
Kit - J×DW1
Order kit JXDW! if your installation
requires horizontal ducting from the
top of the hood through the back
wall and:
. You have an 8 ft. ceiling and need
to use a JXCHSeriesChimneg Cover,
or
You have a 12" cabinet or 12" soffit
that the hood is to be mounted
beneath.
This kit provides a duct transition
from 7" round to 3-1/4"x 10"
rectangular for through-the-wall
venting.
Using a smaller diameter duct size
will reduce performance.
Equivalent
Duct Piece Dimensions Length*
7" Round 1 ft.
straight (per foot
length)
5-1/4" x !2" ! ft.
straight (per foot
length)
7" 90 ° elbow 1/4ft.
7" 45 ° elbow 9 ft.
3-!//4" x 12" 15 ft. 90 ° elbow
3-1//4" x 12" 9 ft.
45 ° elbow
3-1./4"x 12" 36 ft.
90 ° flat elbow
__ 7" round to
3-1//4" x 12" ! ft.
transition
__j_ 3-!/4" x 12"
to 7" round ! ft.
transition
7" round to
3-1/a" x 12" /4ft.
transition 90° elbow
3-!/a" x 12" to
7" round /4ft.
transition 90° elbow
7" round
wall cap 28 ft.
with damper (21 ft. without damper)
3-1//4" x 12"
wall cap 26 ft.
with damper (19 ft. without damp
2 7" round 39 ft.
roof cap
Round 2/4ft.
roof vent
Total
(L)uantitg Equivalent
Used Length
*Actual length of straight duct plusduct fitting
equivalent.Equivalentlengthof duct piecesare
basedon actual tests conducted bg GEEvaluatioin
Engineeringand reflect requirementsfor good
venting performancewith ang ventilation hood.
Total Duct Run
9