Installation guide

Installation Instructions
NOTE: If you need to install ducts, note that the total
duct length of 31/4'' x 10" (8.2 x 25.4 cm) rectangular or
6" (15.2 cm) diameter round duct should not exceed
120 equivalent feet (36.5 m).
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 31/4'' x 10" (8.2 x 25.4 cm) rectangular duct.
If a round duct is required, a rectangulat_to-round
transition adaptor must be used. Do not use less than
a 6" (15.2 cm) diameter duct.
Maximum duct length:
For satisfactory air movement, the total duct length of
31/4" x 10" (8.2 x 25.4 cm) rectangular or 6" (15.2 cm)
diameter round duct should not exceed 120 equivalent
feet (36.5 m).
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.
DUCT PIECES
&
i
%
0
Rectangular-to-Round
TransitionAdaptor*
Wall Cap
90° Elbow
45° Elbow
90° Elbow
45° Elbow
RoofCap
StraightDuct6" (15,2cm)
Roundor 31/4``x 10"
(8,2x 25,4cm)Rectangular
EQUIVALENT
LENGTH
5 Ft, (1,5m)
40 Ft,(12,2m)
10 Ft,(3m)
5 Ft, (1,5m)
25Ft, (7,6m)
5 Ft, (1,5m)
24 Ft,(7,3m)
1 Ft, (0,3m)
NUMBER
x USED
x ()
x ()
x ()
x ()
x ()
x ()
x ()
x ()
EQUIVALENT
LENGTH
Ft,or m
Ft,or m
Ft,or m
Ft,or m
Ft,or m
Ft,or m
Ft,or m
Ft,or m
m
i
Total Ductwork = Ft. or m
* IMPORTANT: If a rectangular to round transition
adaptor is used, the bottom corners of the damper
will have to be cut to lit, 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 performance with
any vent hood.
11