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Installation Instructions
NOTE: If you need to install ducts, note that the total duct
length of 3¼" x 10" rectangular
or 6" diameter round duct
should not exceed 140 equivalent feet.
Outside ventilation requires a HOOD EXHAUST DUCT.
Read the following carefiflly.
NOTE: It is important
that venting be installed ttsing
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 blocldng the ducts.
Exhaust connection:
The hood exhaust has been designed to mate with
a standard 3¼" x 10" rectangular
ducL
ff a round duct is required, a rectangular-to-round
transition adapter must be used. Do not use less than
a 6" diameter duct.
Maximum
duct length:
For satisfactory
air movement,
the total duct length
of
".5¼"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 tlansidons
and adapters
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
G
g
RectangulaFto-Round
TransitionAdapter*
Wall Cap
90° Elbow
45° Elbow
90° Elbow
45° Elbow
EQUIVALENT
NUMBER
LENGTH
x
USED
RoofCap
Straight Duct6" Roundor
3_A"x 10" Rectangular
5R.
40 Ft.
lOFt.
5R.
25 Ft.
5R.
24 Ft.
1R.
x
( )
x
( )
x
( )
x
( )
x
( }
x
( )
x
( )
x
( )
EQUIVALENT
LENGTH
Ft.
Ft.
F_.
Ft.
Ft,
Ft,
Ft.
Total Ductwork
=
Ft.
* IMPORTANT: Ifa rectangularao-round transition adapter is used,
the bottom comers of the damper will have to he cut to fit, 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 _luirements
for good venting perfoimance
with any
vent hood.
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