What is filter class and the EN779 standard

The filter category determines the effectiveness of a filter.
A filter category is assigned based on tests that are included in the EN779 standard. On the basis of the accumulated percentage of dust and dirt that a filter “catches” a category is assigned.

Filters are categorized as follows:G1 to G4 and F5 to F9. In category G, G4 has the highest ranking and is of the best quality likewise an F9 filter in the F category. These filters capture the most dirt and dust in their respective category. . 

filter class and EN779 standard

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