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Installation Preparation
Total
DUCT
FITTINGS
Equivalent
Quantity
Equivalent
STO CE
EIT
Duct Piece
Dimensions
Length*
Used
Length
MeL
Mtoe [ern
Round
ae per '
Transition to 3-1/4" x 10"
straight
oot length)
or 3-1/4" x 12" Duct.
3-1/4" x 10"
1 ft. (per
straight
foot length)
Use this chart to compute maxi-
,
mum permissible lengths
90° elbow
12 ft
for duct runs to outdoors.
NOTE: Do not exceed maximum
45° elbow
7 ft
permissible equivalent lengths!
Maximum duct length:
"
100 foot for range hoods.
3-1/4" x 10
14 ft.
3-1/4" x 12"
10 ft.
Flexible ducting:
90" elbow
If flexible metal ducting is used,
3-1/4" x 10"
8 ft.
all the equivalent feet values in
3-1/4" x 12"
6 ft.
the table should be doubled.
45° elbow
The flexible metal duct should
3-1/4" x 10"
33 ft
be straight and smooth and ex-
3-1/4" ¢ 12"
54 ft
tended as much as possible.
90° flat elbow
DO NOT use flexible plastic
8" round to
2 ft.
ducting.
rectangular
NOTE: Any home ventilation
Rectangular to 8"
2 ft.
system, such as a ventilation
hood, may interrupt the proper
3-1/4" x 10"
4 ft.
flow of combustion air and
3-1/4" x 12"
4 ft.
exhaust required by fireplaces,
8" round to rectangular
gas furnaces, gas water heat-
transition 90° elbow
ers and other naturally vented
systems.
'
3-1/4" x 10"
4 ft.
To minimize the chance of
Sa.
sul ne ig -to 8" round
"ft
interruption of such naturally
nonsition 90° elbow
vented systems, follow the heat-
ing equipment manufacturer's
Round wall cap
24 ft.
guidelines and safety standards
with damper
such as those published by
NFPA and ASHRAE.
[TS
3-1/4" x 10"
24 ft.
ea
3-1/4" x 12"
18 ft.
Rectangular wall cap
with damper
eS
Round roof cap
33 ft
*Actual length of straight duct plus duct fitting
equivalent. Equivalent length of duct pieces are
'Total Duct Run
based on actual tests conducted by GE Evalua-
tion Engineering and reflect requirements for good
venting performance with any ventilation hood.
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