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Control, VVC plus
systems are a special type of constant air volume (CAV) system often
found in hospitals, laboratories, and other institutions where clean
air is essential. They are employed wherever conditioned air must be
filtered just before delivery to the occupied space in order to
prevent contamination of a controlled zone.
The CAV supply fan blows the air across heating and cooling coils as
required and through special micro filters. These filters remove
contaminants from the air before it enters the controlled zone.
Exhaust fans, sometimes also fitted with filters, remove the air
from the zone and channel it to the outside. These fans
need to be
sized to provide design flow even when the filter is dirty and has
its maximum resistance.