GE JV936DSS - Manuel (Page 9)

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
guidelines and safety standards such as
those published by NFPA and ASHRAE.
When applicable, install any makeup
(replacement) air system in accordance
with local building code requirements.
Visit GEAppliances.com for available
makeup air solutions.
Total
Equivalent Quantity Equivalent
Duct Piece Dimensions Length* Used Length
7” Round 1 ft.
straight (per foot
length)
3-1/4” x 12” 1 ft.
straight (per foot
length)
7” 90° elbow 14 ft.
7” 45° elbow 9 ft.
3-1/4” 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” 1 ft.
transition
3-1/4” x 12”
to 7” round 1 ft.
transition
7” round to
3-1/4” x 12” 4 ft.
transition 90° elbow
3-1/4” x 12” to
7” round 4 ft.
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
7” round 39 ft.
roof cap
Round 24 ft.
roof vent
Total Duct Run
* Actual length of straight duct plus duct fitting
equivalent. Equivalent length of duct pieces are
based on actual tests conducted by GE Evaluatioin
Engineering and reflect requirements for good
venting performance with any ventilation hood.
9
Installation Instructions
This Hood Must Use 7” Round
Duct. It Can Transition To
3-1/4” x 12” Duct.
Using a smaller diameter duct size
will reduce performance.
Kit - JXDW1
Order kit JXDW1 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 JXCH Series Chimney 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.