A HEPA filter can retain suspended particles larger than 1 µm (1/1000 mm). This means that corona viruses, in addition to all other impurities, are also retained.
Filter class H13:
Separation efficiency 99,95%
Filter class H14:
Separation efficiency 99,995%
The table shows how incredibly many particles are removed from the air by the filters. Out of 100,000 particles, only 5 particles get through with an H14 filter. These numbers illustrate the benefit of using HEPA filters in terms of reducing airborne pollutants.
Cleaning HEPA filters
It is indicated when the filter needs to be changed. (Within 9-12 months depending on air pollution).