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Air filter classes (ISO 16890)
Air filter classes under ISO 16890 show what share of particles of a given size a filter captures.
Filters in ventilation units are classified under the ISO 16890 standard. It rates the percentage of particles a filter captures in three size groups:
- ePM1 – the finest particles up to 1 µm (part of smog and soot);
- ePM2.5 – particles up to 2.5 µm;
- ePM10 – larger particles up to 10 µm (dust, pollen);
- Coarse – coarse filters for large particles.
For example, “ePM1 55%” means the filter captures at least 55% of particles up to 1 µm. The older EN 779 standard (classes G4, M5, F7) is still encountered, but the classes do not map directly.
A finer filter cleans the air better but adds more resistance, so it must be matched to the unit’s fan. Clogged filters reduce airflow and increase energy use – they should be replaced according to the manufacturer’s recommendation and operating conditions. Our specialists will help choose filters for your Lossnay unit and remind you when to change them.