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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 ⁄ 4 " x 10"(8.2 x 25.4 cm) rectangular or
5" (12.7 cm)diameter/ 6 " (15.2 cm) diameter round duct
should not exceed 140 equivalent feet (42.7 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 a
standard 3 1 ⁄ 4 " x 10" (8.2 x 25.4 cm) rectangular duct.
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 1
10"(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
d.A 5 " (12.7cm)/ 6 " (15.2cm)
EQUIVALENT
LENGTH
5 Ft. (1.5 m)
40 Ft. (12.2 m) x
10 Ft. (3 m)
5 Ft. (1.5 m)
25 Ft. (7.6 m) x
5 Ft. (1.5 m)
24 Ft. (7.3 m) x
1 Ft. (0.3 m)
⁄4
" x
Maximum duct length:
For satisfactory air movement, the total duct length of
3 1 ⁄4" x 10" (8.2 x 25.4 cm) rectangular or 5" (12.7 cm)
diameter/ 6 "(15.2 cm) diameter round duct should not
exceed 140 equivalent feet (42.7 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
(
)
Total Ductwork
Equivalent lengths of duct pieces are based on
actual tests and reflect requirements for good
venting performance with any vent hood.
EN-14
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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