INSTALLATION INSTRUCTIONS
EXHAUST CONNECTION
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.
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.
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.
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.
ELBOWS, TRANSITIONS, WALL
AND ROOF CAPS ETC..,
Rectangular
-to-Round
5
Ft.
x
(
)
=
Ft.
Transition
Adaptor*
W all
Cap
40
Ft.
x
(
)
=
Ft.
90˚Elbow
10
Ft.
x
(
)
=
Ft.
45˚Elbow
5
Ft.
x
(
)
=
Ft.
90˚Elbow
25
Ft.
x
(
)
=
Ft.
45˚Elbow
5
Ft.
x
(
)
=
Ft.
Roof
Cap
24
Ft.
x
(
)
=
Ft.
Straight
Duct
6 Round
or
1
Ft.
x
(
)
=
Ft.
3
1
4
x
10 Rectangular
Total
Ductwork
=
F t.
DUCT PIECES
EQUIVALENT
LENGTH
NUMBER
USED
x
=
EQUIVALENT
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.
Equivalent lengths of duct pieces are based on actual
tests and reflect requirements for good venting per-
formance with any vent hood.
5
Rectangular-to-Round
Transition Adaptor*
5 Ft.
x
( )
=
Ft.
Wall Cap
40 Ft.
x
( )
=
Ft.
Elbow
10 Ft.
x
( )
=
Ft.
45 Degree Elbow
5 Ft.
x
( )
=
Ft.
90 Degree Elbow
25 Ft.
x
( )
=
Ft.
45 Degree Elbow
5 Ft.
x
( )
=
Ft.
Roof Cap
24 Ft.
x
( )
=
Ft.
Straight Duct 6’’ Round or
31/4’’ x 10’’ Rectangular
1 Ft.
x
( )
=
Ft.
Total Ductwork
Ft.
=
