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Classification of Coarse, Medium and Fine filters according EN 779: Filter Class Final Test Pressure Drop Average Arrestance (Am) of ASHRAE test dust Average Efficiency (Em) of 0.4 µm particles Minimum Efficiency* of 0.4 µm particles : Pa : G1: 250: 50% ≤ Am : 65%--G2: 250: 65% ≤ Am : 80%--G3: 250: 80% ≤ Am : 90%--G4: 250: 90% ≤ ...

EN 779 defines 9 cl… for coarse, medium and fine filters • Principle of the test method was set up in the 1960s • Filtration quality is measured by using one test aerosol with 0,4 µm. Why a new standard? • Particulate Matter is divided into three particle sizes : • ePM10