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Hood exhaust
When venting exhaust to the outside, hood exhaust ducts
will be required. 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.
The hood exhaust has been designed to mate with a
standard 3¼" x 10" (82 x 254 mm) rectangular duct. If a
round duct is required, a rectangular-to-round transition
adaptor must be used. Do not use less than a 6"
(152 mm) diameter duct.
Duct Pieces
Rectangular-to-Round Tran-
sition Adaptor*
Wall Cap
90° Elbow
45° Elbow
90° Elbow
45° Elbow
For satisfactory air movement, the total duct length of
3¼" x 10" (82 x 254 mm) rectangular or 6" (152 mm)
diameter round should not exceed 120 equivalent feet
(36.5 m).
Elbows, transitions, wall and roof caps etc. cause
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:
x
5 ft (1.5 m)
x
40 ft (12.2 m)
x
10 ft (3 m)
x
5 ft (1.5 m)
x
25 ft (7.6 m)
x
5 ft (1.5 m)
x
Number used
=
Equivalent Length
=
=
=
=
=
=
Total Ductwork =
13
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