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NOTE: If you need to install ducts, note that the total duct
length of 3
1
⁄
" x 10" rectangular or 6" diameter round duct
4
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 3
1
⁄
" x 10" rectangular duct.
4
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
3
1
⁄
" x 10" Rectangular
4
* 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.
Installation Instructions
EQUIVALENT
LENGTH
5 Ft.
40 Ft.
10 Ft.
5 Ft.
25 Ft.
5 Ft.
24 Ft.
1 Ft.
5
Maximum duct length:
For satisfactory air movement, the total duct length of
3
1
⁄
" x 10" rectangular or 6" diameter round duct should
4
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
( )
Total Ductwork =
Equivalent lengths of duct pieces are based on actual tests and
reflect requirements for good venting performance with any vent
hood.
EQUIVALENT
=
LENGTH
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
Ft.
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