10
Installation preparation
DucT
fITTINGS
Use 3-1/4" x 10"
duct. It can
transition to 6"
round.
Total
Equivalent Quantity
Equivalent
Duct Piece
Dimensions
Length*
Used
Length
1 ft.
6" round,
(per foot
straight
length)
1 ft.
3-1⁄4" x 10"
(per foot
straight
length)
6"
90° elbow
12 ft.
6"
45° elbow
7 ft.
3-1⁄4" x 10"
90° elbow
14 ft.
3-1⁄4" x 10"
45° elbow
8 ft.
3-1⁄4" x 10"
90° flat elbow
33 ft.
6" round
to 3-1⁄4" x 10"
transition
2 ft.
3-1⁄4" x 10"
round to 6"
transition
2 ft.
6" round to
3-1⁄4" x 10"
transition
90° elbow
4 ft.
3-1⁄4" x 10" to 6"
round transition
90° elbow
4 ft.
6" round
wall cap
with damper
24 ft.
3-1⁄4" x 10"
wall cap
with damper
24 ft.
6" round
roof cap
33 ft.
Total Duct Run
Use this chart to
compute maximum
permissible lengths
for duct runs to
outdoors.
NoTe: Do not exceed
maximum permissible
equivalent lengths!
Downdraft Vent:
150' maximum
equivalent length
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.
*Actual length of straight duct plus duct fitting
equivalent. Equivalent length of duct pieces is based
on actual tests conducted by GE Evaluation Engineering
and reflect requirements for good venting performance
with any downdraft cooktop.
NoTe: Any home
ventilation system,
such as a cooktop with
a downdraft exhaust
mechanism, 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.
Dia14.B
Dia14.C
Dia14.D
Dia14.E
Dia14.F
Dia14.G
Dia14.H
Dia14.I
Dia14.J
Dia14.K
Dia14.L
Dia14.M
Dia14.N