GE JV935 - Manual (Page 10)

10
Installation Instructions
DUCT FITTINGS
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″
90
° elbow
15 ft.
3-1⁄4
″ x 12″
45 ° elbow 9 ft.
3-1⁄4
″ x 12″
90 ° flat elbow 36 ft.
7 ″ round to
3-1⁄4 ″ x 12″
transition 1 ft.
3-1⁄4 ″ x 12″ to 7″ round
transition 1 ft.
7 ″ round to
3-1/4
″ x 12″
transition 90
° elbow
4 ft.
3-1⁄4
″ x 12″ to 7″ round
transition 90
° elbow
4 ft.
7
″ Round
wall cap
with damper
28 ft. (21 ft. without damper)
3-1⁄4
″ x 12″
wall cap with
damper
26 ft. (19 ft. without damper)
7 ″ Round
roof cap 39 ft.
Round
roof vent
24 ft.
Use this chart to compute maximum
permissible lengths for duct runs to
outdoors.
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 smooth and
extended as much as possible.
Do NOT use flexible plastic ducting.
Total Duct Run
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 manufacturer’s guidelines and safety
standards such as those published by NFPA and ASHRAE.
*Actual length of straight duct plus duct fitting equivalent.
Equivalent length of duct pieces are based on actual
tests conducted by GE Evaluation Engineering and
reflect requirements for good venting performance
with any ventilation hood.
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
Note:
Note:
venting.
″