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Airflow Rate

 This is the air volume required to extract or supply air into a room during a given time. Several methods can be used to calculate the air flow:

1  After calculating the volume of the room, multiply volume by the number of Air Changes per Hour (ACH) :
This calculates the air flow required in meters cubed/hr (m³/h)
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 These values must not take the place of any regulation requirements and can be modified for particular applications cross sectional area.

2  Depending on the ventilation rates per person :

  • 20 – 25 m³/h per person for normal activity.
  • 30 – 35 m³/h per person if smoking is allowed.
  • 45 m³/h per person in case of light physical work.
  • 60 m³/h per person in case of greater physical activity.
These values are minimum air flows.

3  Air velocity required for capturing or transporting particular matter :

To calculate air volume (m³/s) it is necessary to multiply the air velocity by the duct cross sectional area.

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