Installation Preparation; Duct Fittings - GE Monogram ZV750 Installation Instructions Manual

Duct
Use this chart to
compute maximum
fittings
permissable lengths
for duct runs to
outdoors.
This Hood Must
Note: Do not exceed
Use 6" Round Duct
maximum permissable
It Can Transition to equivalent lengths!
3-1/4" x 10" or
Maximum duct length:
3-1/4" x 12" Duct
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.

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 6" 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 Evaluation
Engineering and reflect requirements for good
venting performance with any ventilation hood.
36" Vent Hood
Equivalent Quantity Equivalent
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
Length
5