VAV - Variable air volume

VAV allows for two-stage airflow control in each zone.

This allows ventilation to be controlled independently of when individual rooms are being used, though not how much they are loaded.

VAV is typically used when:

- Rooms are used periodically
- There is little variation in impact by persons in the room
- There is little variation in impact by persons in the room

Examples: North-facing classrooms, offices.

Features Advantages Disadvantages
- Clock and week plan control on and off times
  for basic ventilation
- Switch or motion sensor
  turns up the ventilation
  in the individual rooms
- A regulator maintains a constant pressure
  in the duct system, so that airflow
  is correctly distributed.
- Ventilation only in the rooms
  in use
- Same airflow
  in the room
  regardless of number of persons
- Risk of frequent updating
  of week plan

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