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10
Installation Preparation
DUCT
FITTINGS
Use 3-1/4" x 10"
duct. It can
transition to 6"
round.
Total
Equivalent Quantity Equivalent
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.
Use this chart to
compute maximum
permissible lengths
for duct runs to
outdoors.
NOTE:
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.
plastic ducting.
*Actual length of straight duct plus duct tting
equivalent. Equivalent length of duct pieces is based
on actual tests conducted by GE Evaluation Engineering
and reect 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
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