10
Installation Preparation
DUCT
FITTINGS
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duct. It can
transition to 6"
round.
Total
Equivalent Quantity Equivalent
Duct Piece Dimensions Length* Used Length
1 ft.
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1 ft.
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6"
90° elbow 12 ft.
6"
45° elbow 7 ft.
ø[
90° elbow 14 ft.
ø[
45° elbow 8 ft.
ø[
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6" round
WRø[
transition 2 ft.
ø[
round to 6"
transition 2 ft.
6" round to
ø[
transition
90° elbow 4 ft.
ø[WR
round transition
90° elbow 4 ft.
6" round
wall cap
with damper 24 ft.
ø[
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!
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equivalent. Equivalent length of duct pieces is based
on actual tests conducted by GE Evaluation Engineering
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with any downdraft cooktop.
Downdraft Vent: 100' maximum
equivalent length
Flexible ducting:
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equivalent feet values in the table should
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be straight and smooth and extended as
much as possible.
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NOTE: Any home ventilation system, such
as a cooktop with a downdraft exhaust
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of combustion air and exhaust required by
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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. When applicable,
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in accordance with local building code
requirements. Visit GEAppliances.com for
available makeup air solutions.
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