ISO 16890
According to new ISO standard filters are divided into four groups. A prerequisite for each group is that a filter captures at least 50 % of the appropriate particle size range. If a filter, for example, captures more than 50 % of PM1 particles, it will be grouped as an ISO ePM1 filter. The respective efficiency is then reported, rounded in 5 % increments.
Alongside fine dust filters, the new ISO standard also evaluates coarse dust filters as ISO coarse: that is, filters that capture less than 50 % PM10.
Class | Efficiency | Particle size | |
ISO ePM1 | ePM1, min ≥50% | 0,3 ≤ x ≤ 1 | |
ISO ePM2,5 | ePM2,5 min ≥50% | 0,3 ≤ x ≤ 2,5 | |
ISO ePM10 | ePM10 ≥50% | 0,3 ≤ x ≤ 10 | |
ISO coarse | ePM10 ≥50% |