Measurement of Ventilation Efficiency

The task of ventilation is to provide fresh air to the zone where people live and work and/or to extract contaminants effectively almost directly from the source. Depending on building and room type the situation can be quite different.

Some typical examples from practice are listed below:

  1. If mould growth exist some parts are probably underventilated and need more air
  2. In industrial facilities usually the working or occupancy zone is of interest. The ventilation system shall provide fresh air to people.
  3. In production facilities emissions from processes and machines shall be effectively drawn off from the occupied zone.
  4. Displacement flow ventilation systems in offices should maintain a comfortable indoor climate at the working place and remove heat emissions effectively. They should not work like a mixed-air system.

In a mechanically ventilated zone a tracer gas test can quantify the airflow pattern in the zone. The determination of the ventilation effectiveness proves whether the ventilation system works like a displacement system or if complete mixing or short circuiting prevails.