DUCT FITTINGS
This Hood Must Use an
6" Round Duct. It Can
Transition to 3-1/4" x 10"
or 3-1/4" x 12" Duct.
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 range 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.
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 manufacturer'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.
31-10724-7
Installation Preparation
Duct Piece
Dimensions
Round,
straight
3-1/4" x 10"
straight
90° elbow
45° elbow
3-1/4" x 10"
3-1/4" x 12"
90° elbow
3-1/4" x 10"
3-1/4" x 12"
45° elbow
3-1/4" x 10"
3-1/4" x 12"
90° flat elbow
6" round to
rectangular
Rectangular to 8"
round
3-1/4" x 10"
3-1/4" x 12"
6" round to rectangular
transition 90° elbow
3-1/4" x 10"
3-1/4" x 12"
Rectangular to 6" round
transition 90° elbow
Round wall cap
with damper
3-1/4" x 10"
3-1/4" x 12"
Rectangular wall cap
with damper
Round roof cap
* Actual length of straight duct plus duct fitting
equivalent. Equivalent length of duct pieces are
based on actual tests conducted by GE Appliances
Evaluation Engineering and reflect requirements for
good venting performance with any ventilation hood.
Equivalent
Quantity
Length*
Used
1 ft. (per
foot length)
1 ft. (per
foot length)
12 ft.
7 ft.
14 ft.
10 ft.
8 ft.
6 ft.
33 ft.
24 ft.
2 ft.
2 ft.
4 ft.
4 ft.
4 ft.
4 ft.
24 ft.
24 ft.
18 ft.
33 ft.
Total Duct Run
Total
Equivalent
Length
5