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Centerline
notches
Hole B
Horizontal Line
Area E
Hood Exhaust
NOTE: If you need to install ducting, note that the total duct
length of 31/4" x 10" (8.2 x 25.4cm) rectangular or 5" (12.7cm)
or 6" (15.2cm) diameter round duct should not exceed 120
equivalent feet (36.5m).
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 exhaust adapter has been designed to mate with a
standard 31/4" x 10" (8.2 x 25.4cm) rectangular duct.
If a round duct is required, a rectangular-to-round transiting
adapter must be used. A 5" (12.7cm) or 6" (15.2cm)
diameter duct is acceptable to use.
Maximum Duct Length
For satisfactory air movement, the total duct length of 31/4"
x 10" (8.2 x 25.4 cm) rectangular or 5" (12.7cm)/6" (15.2cm)
diameter round duct should not exceed 120 equivalent
feet (36.5m).
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 adapters plus the length of
all straight duct sections. The chart below shows you how
to calculate total equivalent ductwork length using the
approximate feet of equivalent length of some typical ducts.
Draw a Vertical Line
on Wall from Center
of Top Cabinet
C L
Hole A
Horizontal Line
Draw a horizontal line on wall at the
bottom of "Rear Wall Template".
Part
Description
Rectangular-to-
Round
Transition Adapter*
Wall Cap
90° Elbow
45° Elbow
90° Elbow
45° Elbow
Roof Cap
Straight Duct 6"
(15.2 cm)
Round or 31/4" x 10"
(8.2 x 25.4 cm)
Rectangular
Total Ductwork
=
IMPORTANT: If a rectangular-to-round transition adapter is
used, the bottom corners of the damper will have to be cut to fit
using tin snips, in order to allow free movement of the damper.
Equivalent lengths of duct pieces are based on actual tests
and reflect requirements for good venting performance with
any vent hood.
Outside Top Exhaust (Example Only)
The following chart describes an example of one possible
ductwork installation.
Duct
Description
Pieces
Roof Cap
12 Ft. (3.6m)
Straight Duct
(6"/15.2cm
Round)
Rectangular-
to-Round
Transition
Adapter*
Equivalent lengths of duct pieces are based on
actual tests and reflect requirements for good
venting performance with any vent hood.
Total Length =
* IMPORTANT: If a rectangular-to-round transition adaptor is
used, the bottom corners of the damper will have to be cut to
fit, using the tin snips, in order to allow free movement of the
damper.
- 6 -
Equivalent Length x
Number Used =
5 Ft. (1.5 m)
x
=
40 Ft. (12.2 m) x
=
10 Ft. (3 m)
x
=
5 Ft. (1.5 m) x
=
25 Ft. (7.6 m) x
=
5 Ft. (1.5 m)
x
=
24 Ft. (7.3 m) x
=
1 Ft. (0.3 m) x
=
Equivalent Length x
Equivalent
Number Used =
Duct Pieces
24 Ft. (7.3m) x
24 Ft.
(1)
=
(7.3m)
12 Ft. (3.7m) x
12 Ft.
(1)
=
(3.7m)
5 Ft. (1.5m)
x
5 Ft.
(1)
=
(1.5m)
41 Ft.
(12.5 m)
CCD-0006072 Rev: 11-15-23
Equivalent
Duct Pieces
Ft. or m
Ft. or m
Ft. or m
Ft. or m
Ft. or m
Ft. or m
Ft. or m
Ft. or m
Ft. or m
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