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2. ASSEMBLY INSTRUCTIONS FOR
EXTERNAL EXHAUST DUCTING
NOTE: If you need to install ducts, note that the total
duct length of 3
1
4
or 5" (12.7 cm) diameter/ 6" (15.2 cm) diameter round
duct should not exceed 120 equivalent feet (36.5 m).
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 block
ages. Also, make sure dampers swing freely and nothing
is blocking the ducts.
Exhaust connection:
The exhaust adaptor has been designed to mate with a
standard 3
" x 10" (8.
1
4
DUCT PIECES
9
2 x 25.4 cm) rectangular duct.
Transition Adaptor*
90° Elbow
45° Elbow
90° Elbow
45° Elbow
Roof Cap
Straight Duct 6" (15.2
cm) Round or 3
" x
1
4
10" (8.2 x 25.4 cm
Rectangular)
* IMPORTANT:
ting performance with any vent hood.
tion adaptor must be used. A 5" (12.7cm)/ 6" (15.2cm)
diameter duct is acceptable to use.
Maximum duct length:
For satisfactory air movement, the total duct length of
3
" x 10" (8.2 x 25.4 cm) rectangular or 5" (12.7 cm)
1
4
diameter/ 6 " (15.2 cm) diameter round duct should not
exceed 120 equivalent feet (36.5 m).
Elbows, transitions, wall and roof caps, etc.,
to a section of straight duct which is longer than their ac
add the equivalent lengths of all transitions and adaptors
plus the length of all straight duct sections. The chart be
low shows you how to calculate total equivalent ductwork
length using the approximate feet of equivalent length of
some typical ducts.
EQUIVALENT
LENGTH
x
5 Ft. (1.5 m)
x
40 Ft. (12.2 m)
x
10 Ft. (3 m)
x
5 Ft. (1.5 m)
x
25 Ft. (7.6 m)
x
5 Ft. (1.5 m)
x
24 Ft. (7.3 m)
x
1 Ft. (0.3 m)
x
Total Ductwork
NUMBER
EQUIVALENT
USED
=
LENGTH
( )
=
( )
=
( )
=
( )
=
( )
=
( )
=
( )
=
( )
=
=
EN
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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