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Advance Planning
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.
Note: Ang home ventilation sgstem, such as a
ventilation hood, mug interrupt the proper flow of
combustion air and exhaust required bg fireplaces,
gas furnaces, gas water heaters and other
noturallg vented sgstems. To minimize the chance
of interruption of such naturallg vented sgstems,
follow the heating equipment manufacturer's
guidelines and safetg standards such as those
published bg NFPA and ASHRAE.When applicable,
install ang makeup (replacement) air sgstem in
accordance with local building code requirements.
Visit GEAppliances.cam
for available makeup air
solutions.
*Hoods are supplied with a
10" round transition.
A Iocallg
supplied transition
is required
for other sizes.
Note: Outlet on top of hood is
8-!/8" x 8".
* Actual l ength of straightductplusductfitting equivalent.
Equivalent lengthofduct pieces arebased on actual
testsconducted bgGEEvaluation E ngineering andreflect
requirements f orgoodventing performance w ithang
ventilation hood.
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.
C_
Round
8" Dia. 99 ft.
wall cap
10" Dia. 41 ft.
with damper
Round
8" Dia. 136 ft.
roof cap
10" Dia. 56 ft.
Total Duct Run
49
80209
5
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