GE ZV541 - Manual (Page 7)

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.
Equivalent Quantity Total
Duct Piece Length* Used Length
10" round
to 8" round
5 ft.
Round, 1 ft.
straight (per foot
length)
90° elbow 8" Dia. 52 ft.
10" Dia. 24 ft.
45° elbow 8" Dia. 31 ft.
10" Dia. 14 ft.
Round 8" Dia. 99 ft.
wall cap 10" Dia. 41 ft.
with damper
Round 8" Dia. 136 ft.
roof cap 10" Dia. 56 ft.
7
Advance Planning
DUCT FITTINGS
Total Duct Run
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.
* 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.
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".