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NOTE: If you need to install ducts, note that the total duct
length of 3
⁄
" x 10" rectangular or 6" diameter round duct
1
4
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 3
⁄
" x 10" rectangular duct.
1
4
If a round duct is required, a rectangular-to-round
transition adaptor must be used . Do not use less than a
6" diameter duct.
DUCT PIECES
Rectangular-to-Round
Transition Adaptor*
Wall Cap
90° Elbow
45° Elbow
90° Elbow
45° Elbow
Roof Cap
Straight Duct 6" round or
3
⁄
" x 10" Rectangular
1
4
* IMPORTANT: If a rectangular-to-round transition
32
Installation Instructions
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 .
Maximum duct length:
For satisfactory air movement, the total duct length of
3
⁄
" x 10" rectangular or 6" diameter round duct should
1
4
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 .
EQUIVALENT
LENGTH
x
5 Ft .
x
40 Ft .
x
10 Ft .
x
5 Ft .
x
25 Ft .
x
5 Ft .
x
24 Ft .
x
1 Ft .
x
Equivalent lengths of duct pieces are based on
actual tests and reflect requirements for good venting
performance with any vent hood .
NUMBER
USED
=
( )
=
( )
=
( )
=
( )
=
( )
=
( )
=
( )
=
( )
=
Total Ductwork =
LENGTH
Ft .
Ft .
Ft .
Ft .
Ft .
Ft .
Ft .
Ft .
Ft.
1" = 2.5 cm; 1' = 0.3 m
29-6379
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