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EQUIVALENT NUMBER EQUIVALENT
DUCT PIECES LENGTH x USED = LENGTH
Rectangular-to-Round 5 Ft. x ( ) = Ft.
Transition Adaptor*
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 1 Ft. x ( ) = Ft.
3
1
⁄4″ x 10″ Rectangular
Total Ductwork = Ft.
Equivalent lengths of duct pieces are based on actual tests
and reflect requirements for good venting performance with
any vent hood.
* 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 the damper
.
NOTE: If you need to install ducts, note that the total
duct length of 3
1
⁄4″ 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 3
1
⁄4″ 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
3
1
⁄4″ 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.
5
Installation Instructions