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NOTE: If you need to install ducts, note that the total
duct length of 344" 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
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 314" x 10" rectangular duct.
If a round duct is required, a rectangular-to-round
MAXIMUM DUCT LENGTH:
For satisfactory air movement, the total duct length
of 3%" x 10" rectangular or 6" diameter round duct
should not exceed 140 equivalent feet.
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.
transition adaptor must be used. Do not use less
than a 6" diameter duct.
EQUIVALENT
EQUIVALENT
DUCT PIECES
LENGTH
NUMBER USED
=
LENGTH
~
Rectan
gular-to-Round
_
EA
Transition Adaptor*
5 Ft.
x
(
)
~
Ft
[>
Wall Cap
40 Ft.
x
()
-
Ft
OD
90° Elbow
10 Ft.
Xx
(
)
=
Ft
Q
45° Elbow
5 Ft.
Xx
(
}
=
Ft
EF
90° Elbow
25 Ft.
x
(
)
=
Ft
ZB
45° Elbow
5 Ft.
x
()
=
Ft
Cs
Roof Cap
24 Ft.
Xx
(
)
=
Ft
Straight Duct 6"
LP
Round or 3%" x 10"
1 Ft.
Xx
(
}
=
Ft.
Rectangular
Total Ductwork
=
Ft.
* 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
ad
the damper.
Equivalent lengths of duct pieces are based on actual tests and reflect requirements for
good venting performance with any vent hood.
