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INSTALLATION INSTRUCTIONS FOR EXTERNAL EXHAUST DUCTING
NOTE: If you need to install ducts, note that the total
duct length of 3
1
⁄
" x 10" (8.2 x 25.4 cm) rectangular or
4
5"
(12.
7 cm)
diameter/ 6
should not exceed 120 equivalent feet (36.5 m).
Outside ventilation requires an EXTERNAL 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 adaptor has been designed to mate with
" x 10" (8.2 x 25.4 cm) rectangular duct.
a standard 3
1
⁄
4
If a round duct is required, a rectangular-to-round
transition adaptor must be used.
diameter duct is acceptable to use.
DUCT PIECES
Rectangular-to-Round
Transition Adaptor*
Wall Cap
90° Elbow
45° Elbow
90° Elbow
45° Elbow
Roof Cap
Straight Duct 6" (15.2 cm)
Round or 3
(8.2 x 25.4 cm 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.
Installation Instructions
" (15.2 cm) diameter round duct
"
"
A 5" " " ' ' ' ' ' " (12.7cm)/ 6" (15.2cm)
EQUIVALENT
LENGTH
5 Ft. (1.5 m)
40 Ft. (12.2 m)
10 Ft. (3 m)
5 Ft. (1.5 m)
25 Ft. (7.6 m)
5 Ft. (1.5 m)
24 Ft. (7.3 m)
1 Ft. (0.3 m)
1
⁄
" x 10"
4
Maximum duct length:
For satisfactory air movement, the total duct length of
3
1
⁄
" x 10" (8.2 x 25.4 cm) rectangular or
4
6 "(15.2 cm) diameter round duct should not
diameter/
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.
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.
EN-10
5"
(12.
7 cm)
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
=
Ft. or m
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