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NOTE: If you need to install ducts, note that the total
duct length of 3¼" x 10" rectangular or 6" diameter
round duct should not exceed 140 equivalent feet.
Outside ventilation requires a HOOD EXHAUST DUCT.
Read the following carefully.
NOTE: It is important that venting be installed using
the most direct route and with as few elbows as
possible. This ensures clear venting of exhaust and
helps prevent blockages. Also, make sure dampers
swing freely and nothing is blocking the ducts.
Exhaust connection:
The hood exhaust has been designed to mate with a
standard 3¼" x 10" rectangular duct.
If a round duct is required, a rectangular-to-round
transition adaptor must be used. Do not use less
than a 6" diameter duct.
DUCT PIECES
Rectangular-to-Round
Transition Adaptor*
Wall Cap
90° Elbow
45° Elbow
90° Elbow
45° Elbow
Roof Cap
Straight Duct 6" Round or
3¼" x 10" Rectangular
*
ME21K6000AS_AA_DE68-04108C-00_EN.indd 5
EQUIVALENT
LENGTH
5 ft.
40 ft.
10 ft.
5 ft.
25 ft.
5 ft.
24 ft.
1 ft.
IMPORTANT: If a rectangular-to-round
transition adaptor is used, the bottom
corners of the damper will have to be cut to
fit, using tin snips, to allow free movement
of the damper.
General information
Maximum duct length:
For satisfactory air movement, the total duct length
of 3¼" x 10" rectangular or 6" diameter round duct
should not exceed 140 equivalent feet.
Elbows, transitions, wall and roof
caps, etc.
present additional resistance to airflow
and are equivalent to a section of straight duct which is
longer than their actual physical size. When calculating
the total duct length, add the equivalent lengths of all
transitions and adaptors plus the length of all straight
duct sections. The chart below shows you how to
calculate total equivalent ductwork length using the
equivalent length in feet of some typical ducts.
NUMBER
x
USED
x
(
)
x
(
)
x
(
)
x
(
)
x
(
)
x
(
)
x
(
)
x
(
)
Total Ductwork
Equivalent lengths of duct pieces
are based on actual tests and reflect
the requirements for good venting
performance with any vent hood.
5
EQUIVALENT
=
LENGTH
=
ft.
=
ft.
=
ft.
=
ft.
=
ft.
=
ft.
=
ft.
=
ft.
=
ft.
5/20/2016 5:06:28 PM
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