Duct Fittings - GE ZV421 Installation Instructions Manual

DUCT FITTINGS

Use this chart to compute maximum
permissible lengths for duct runs to
outdoors.
For best results, use 10" diameter duct.
Note: Do not exceed maximum permissible
equivalent lengths!
Maximum recommended duct
length for these hoods: 150 feet
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.
Any home ventilation system, such as a ventilation
Note:
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.
Hoods Are Equipped
For 10" Round Duct
*Hoods are supplied with a 10"
round transition. A locally
supplied transition is required
for other sizes.
Note: Outlet on top of hood is
8-1/8" x 8".
* 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.
Advance Planning
Duct Piece
10" round
to 8" round
Round,
straight
90° elbow
45° elbow
Round
wall cap
with damper
Round
roof cap
7
Equivalent Quantity Total
Length* Used Length
5 ft.
1 ft.
(per foot
length)
8" Dia. 52 ft.
10" Dia. 24 ft.
8" Dia. 31 ft.
10" Dia. 14 ft.
8" Dia. 99 ft.
10" Dia. 41 ft.
8" Dia. 136 ft.
10" Dia. 56 ft.
Total Duct Run