Installation guide

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
StraightDuct6" Roundor
3_A"x 10" Rectangular
5R.
40Ft.
lOFt.
5R.
25 Ft.
5R.
24Ft.
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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