GE Monogram ZV750 Installation Instructions Manual page 5

Installation Preparation
36" Vent Hood
Duct
fittings
Use this chart to
compute maximum
permissable lengths
for duct runs to
outdoors.
Note: Do not exceed
maximum permissable
equivalent lengths!
Maximumductlength:
100footfor rangehoods.
Flexible ducting:
If flexible metal
ducting is used, all
the equivalent feet
values in the ruble
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,
followthe heating equipment
manufacturer's guidelines and
safety standards such as those
published by NFPA and
ASHRAE.
Duct Piece
%
%>
Dimensions
RotlI](1,
straight
3-1/4" x l 0"
straight
Equivalent Quantity
I,ength* Used
lit.
(per foot
length)
lit.
(per foot
length)
90 ° elbow 12 It.
45 ° elbow 7 It.
3-1/4" x 10" 14ft.
3-1/4" x 12" l0 It.
90 ° elbow
3-1/4" x 10" 8 ft.
3-1/4" x 12" 6ft.
45 ° elbow
3-1/4" x 10" 33 It.
3-1/4" x 12" 24 It.
90 ° flat elbow
()" I'OtlIld
to
rectangular 2 It,
Total
Equivalent
I,ength
©
Rectangular
to 6" round 2 It.
3-1/4" x 10" 4 ft.
3-1/4" x 12" 4 ft.
()" I'OLIHd tO
rectangular
transition 90 ° elbow
3-1/4" x 10" 4 It.
3-1/4" x 12" 4ft.
Rectangular to 6" round
transition 90 ° elbow
Round
wall cap
with damper 24 It.
3-1/4" x 10" 24 ft.
3-1/4" x 12" 18ft.
Rectangular wall cap
with damper
Round roof cap 33 ft.
*Actual length of straight duct plus duct fitting
equivalent. Equivalent length of duct pieces are
based on actual tests conducted by 6E Evaluation
Engineering and reflect requirements for good
venting performance with any ventilation hood.
Total Duct Run