Air filtration classes
The classification of air filters is based on the filtration efficiency. On this basis, we distinguish pre-filters, accurate, Epa, Hepa, and Ulpa. Parameters allowing to describe and assess the level of filtration are: Filtration efficiency and loss of air pressure during the air flow through the filter. Initial filters are defined by the letter "G", exact filters "M" and "F", Epa "E", Hepa "H", Ulpa "U". In addition to the letters, numbers describing the effectiveness of filtration were also included. The higher the number, the better the efficiency and the ability to stop airborne contaminants.
Split filters | Filter class | Average purification accuracy | Filter class | Filter class EN ISO 16890 | |||
PN-EN 779 | PN-EN 779 PN-EN 1822-1 | (%) | DIN 24185, DIN24184 EUROvent | Coarse (zgrubny) >4 µm | ePM1 | ePM2,5 | ePM10 |
Initial filters | G1 | <65 | EU1 | ISO coarse 0-25% | - | - | - |
| G2 | 65-80 | EU2 | ISO coarse 30-40% | - | - | - |
| G3 | 80-90 | EU3 | ISO coarse 45-55% | - | - | - |
| G4 | >90 | EU4 | ISO coarse 60-95% | - | - | - |
Fine filters | M5 | 40-60 | EU5 | - | 5-35% | 10-45% | 40-70% |
| M6 | 60-80 | EU6 | - | 10-40% | 20-50% | 60-80% |
| F7 | 80-90 | EU7 | - | 40-65% | 65-75% | 80-90% |
| F8 | 90-95 | EU8 | - | 65-90% | 75-95% | 90-100% |
| F9 | >95 | EU9 | - | 80-90% | 85-95% | 90-100% |
Epa filters | E10 | 85 | EU10 |
| |||
| E11 | 95 | EU11 | ||||
| E12 | 99,5 | EU12 | ||||
Hepa filters | H13 | 99,95 | EU13 | ||||
| H14 | 99,995 | EU14 | ||||
Ulpa filters | U15 | 99,9995 | EU15 | ||||
| U16 | 99,99995 | EU16 | ||||
| U17 | 99,999995 | EU17 | ||||
