An HVAC system is usually dimensioned based on the heat load of the space that requires cooling. But the required ventilation needs, depending on both application and occupation, are often overlooked. A simple air change calculation may assist in finding the right amount of fresh air ventilation.

**Simple calculation :-**

- Use the table below to find the required amount of air changes per hour.
- Calculate the volume of the space to be conditioned in either m³ (for SI units) or in ft³ (for I-P units). Calculate the required airflow: Airflow

**Air changes table :-**

The table below shows the required air change rate values based on data from The Engineering Toolbox [1], Nuaire [2] and Technisch Adviesbureau Betuwe [3].

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