GE ZV750SPSS - Manual (Page 5)

DUCT FITTINGS
This Hood Must Use an
6ļ Round Duct. It Can
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RUļ[ļ 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:
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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.
5
Installation Preparation
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 Evaluation
Engineering and reflect requirements for good
venting performance with any ventilation hood.
Total
Equivalent Quantity Equivalent
Duct Piece Dimensions Length* Used Length
Round, 1 ft. (per
straight foot length)
3-1/4ļ x 10ļ 1 ft. (per
straight foot length)
90° elbow 12 ft.
45° elbow 7 ft.
3-1/4ļ x 10ļ 14 ft.
3-1/4ļ x 12ļ 10 ft.
90° elbow
3-1/4ļ x 10ļ 8 ft.
3-1/4ļ x 12ļ 6 ft.
45° elbow
3-1/4ļ x 10ļ 33 ft.
3-1/4ļ x 12ļ 24 ft.
90° flat elbow
6ļ round to 2 ft.
rectangular
Rectangular to 8ļ 2 ft.
round
3-1/4ļ x 10ļ 4 ft.
3-1/4ļ x 12ļ 4 ft.
 6ļ round to rectangular
transition 90° elbow
3-1/4ļ x 10ļ 4 ft.
3-1/4ļ x 12ļ 4 ft.
Rectangular to 6ļround
transition 90° elbow
Round wall cap 24 ft.
with damper
3-1/4ļ x 10ļ 24 ft.
3-1/4ļ x 12ļ 18 ft.
Rectangular wall cap
with damper
Round roof cap 33 ft.