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Installation
Instructions
NOTE: If you need to install ducts, note that the total
duct length of 31/,'' 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
_ossible. 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 31/,'' x 10" rectangular
duct.
If a round duct is required, a rectangular-to-round
transition adaptor must be used. Do not use less
than a 6" diameter
duct.
Maximum
duct length:
For satisfactory
air movement, the total duct length of
31¼ '' 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.
DUCT PIECES
EQUIVALENT
NUMBER
EQUIVALENT
LENGTH
x
USED
=
LENGTH
Rectangular-to-Round
Transition Adaptor*
5 Ft.
x
( )
=
Ft.
Wall Cap
40 Ft.
x
( )
=
Ft.
(_
90 ° Elbow
10 Ft.
x
( )
=
Ft.
(_
45 ° Elbow
5 Ft.
x
( )
=
Ft.
90 ° Elbow
25 Ft.
x
( )
=
Ft.
45 ° Elbow
5 Ft.
x
( )
=
Ft.
Roof Cap
24 Ft.
x
( )
=
Ft.
Straight Duct 6" Round or
31¼ '' x 10" Rectangular
1 Ft.
x
( )
=
Ft.
Total Ductwork
=
Ft.
* IMPORTANT:
If a rectangular-to-
snips, in order to allow free movement of the damper.
round transition adaptor is used, the
Equivalent lengths of duct pieces are based on actual
bottom corners of the damper will
tests and reflect requirements
for good venting
have to be cut to fit, using the tin
performance
with any vent hood.
5
'?7
;
:2
V
}
/ / ,
;"
:*
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