April 28, 2021 | yourfilter GmbH
What different filter classes are there and what is behind the standards?
Part I - Two standards in comparison
The filter classes of the standard DIN EN 779:2012 are very well known and still often used:
DIN EN 779: 2012 vs. DIN EN ISO 16890: 2017
- G1-G4 (Grobstaubfilter)
- M5-M6 (middle dust filter)
- F7-F9 (Feinstaubfilter)
Abb. 1: Norm: DIN EN 779: 2012
This is exactly what the new classification according to DIN EN ISO 16890:2017 reflects. There is a subdivision according to the particle sizes 1 µm, 2.5 µm and 10 µm.
For comparison: A hair has a diameter of about 50-70 µm, a fine grain of sand is about 90 µm in size.
Fig. 2: Comparison of particle sizes 1 - 60 µm
The filter classes according to the new standard
A complete comparison of the filter classes between the old and new standard is therefore not possible. The filters must have been retested according to the new standard and then receive a new filter class that states how high the separation efficiency of the respective particle size is:
- ePM1 ≥ 50%
- ePM2.5 ≥ 50 %
- ePM10 50%
- or "Coarse"
Abb. 3: Standard: DIN ISO 16890: 2017