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Installation of Secondary Supply Duct
A limited amount of conditioned air can be diverted
through a small duct to a location outside of the zone. For
example, a common application is for the cassette unit to
serve an office that has a small attached bathroom. Air
can be supplied to the bathroom from the cassette unit by
following these instructions.
NOTE - Secondary supply duct knockouts are located on
two sides of the V22A cassette body. Only one of the duct
knockouts can be used.
Duct
Screw
Holes (6)
Figure 21. Typical Duct Knockout
Supply Duct
NOTE - The secondary supply duct must be 4 or 6 inches in diameter and 10 feet or less
in length (including transitions).
1. Decide which side of the cassette body will be ducted.
2. Seal the supply air outlet on the side to which the duct
3. Knockout the secondary supply duct opening. See
4. Remove any insulation.
5. Connect the secondary supply duct to the cassette
6. Be sure there is an air-tight seal between the cassette
7. The secondary supply duct must be 4 or 6 inches
NOTE - A field-supplied volume control damper can be
Duct
used to control the amount of air supplied to the space,
Knockout
however, the area being conditioned by the secondary
supply duct will not have control over the temperature of
the air being supplied.
Supports
10 feet maximum
Seal supply air outlet on duct side
Figure 22. Supply Duct Maximum Length
17
will be attached. See the Supply Air Configurations
section for detailed instructions.
Figure 21.
body using the six screw holes shown in Figure 21.
body and the secondary supply duct including any
transitions.
in diameter and 10 feet or less in length (including
transitions).
Drop Ceiling
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