HIGH EFFICIENCY AIR FILTERS ACCORDING TO EN 1822:2019
EPA, HEPA, and ULPA filters are classified in Europe according to EN 1822:2019. This was the
first standard to establish a filter classification system for absolute filters based on the
filtration process theory.
The EN 1822:2019 defines 3 classes:
• Group E: EPA filters (Efficient Particulate Air Filters | efficient air filters)
• Group H: HEPA filters (High Efficiency Particulate Air Filters | high efficiency air filters)
• Group U: ULPA filters (Ultra Low Penetration Air Filters | air filters with very low penetration)
High efficiency air filters are air filters that block at least 85% of the most penetrating
particle size (MPPS). In practice, these are particles of between 0.1 – 0.3 μm in diameter.
The classification indicates what percentage of the MPPS particles are stopped.
This varies from> 85% (class E10) to> 99.999995% (class U17).
High efficiency air filters are used in rooms with very high air quality requirements.
Examples include cleanrooms, aerospace, the pharmaceutical industry, operating theaters
and quarantine departments and in hospitals. The use of HEPA filters is also mandatory for
the removal of asbestos.