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INSTALLATION INSTRUCTIONS
NOTE: If you need to install ducts, note that the total duct
length of 31/4'' 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 pos-
sible. This ensures clear venting of exhaust and helps pre-
vent 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 stan-
dard 31/4'' 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
Rectangular
Transition Adaptor*
T ransition
Wall Cap
W all Cap
Elbow
90˚Elbow
45 Degree Elbow
45˚Elbow
90 Degree Elbow
90˚Elbow
45 Degree Elbow
45˚Elbow
Roof Cap
Roof Cap
Straight Duct 6'' Round or
Straight
Duct 6 Round or
31/4'' x 10'' Rectangular
1 4
3
x 10 Rectangular
* 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.
EQUIVALENT
LENGTH
5 Ft.
-to-Round
5 Ft.
Adaptor*
40 Ft.
40 Ft.
10 Ft.
10 Ft.
5 Ft.
5 Ft.
25 Ft.
25 Ft.
5 Ft.
5 Ft.
24 Ft.
24 Ft.
1 Ft.
1 Ft.
MAXIMUM DUCT LENGTH
For satisfactory air movement, the total duct length of
31/4'' 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 approximate feet of equivalent
length of some typical ducts.
NUMBER
x
USED
x
(
)
x
( )
x
(
)
x
( )
x
(
)
x
( )
x
(
)
x
( )
x
(
)
x
( )
x
(
)
x
( )
x
(
)
x
( )
x
(
)
x
( )
Total Ductwork
Total Ductwork
Equivalent lengths of duct pieces are based on actual
tests and reflect requirements for good venting per-
formance with any vent hood.
5
EQUIVALENT
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LENGTH
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Ft.
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Ft.
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Ft.
=
Ft.
=
Ft.
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Ft.
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Ft.
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Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
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Ft.
=
F t.
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