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English 5
General information
DUCT PIECES
EQUIVALENT
LENGTH
x
NUMBER
USED
=
EQUIVALENT
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
3 ¼˝ x 10˝
Rectangular
1 ft. x ( ) = ft.
Total Ductwork = ft.
*IMPORTANT: If a rectangular-to-round transition adaptor is
used, the bottom corners of the damper will
have to be cut to t, using tin snips, to allow free
movement of the damper.
Equivalent lengths of duct pieces are based on
actual tests and reect the requirements for good
venting performance with any vent hood.
NOTE
If you need to install ducts, note that the total duct length of 3 ¼˝ 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 ¼˝ 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 ¼˝ 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 airow
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
equivalent length in feet of some typical ducts.
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