The ISO 16890 standard for filter testing and assessment replaced the previous EN 779 standard in mid-2018. Now, filter efficiencies will be determined with regard to the particulate classes PM1, PM2,5 and PM10, as well as coarse dust. The ISO 16890 standard is thus based on the same evaluation parameters used by the WHO and other environmental authorities.
In Europe, EPA, HEPA and ULPA filters are subject to classification according to EN 1822 for filtration efficiency and zero leakage. The international standard ISO 29463 is based on this European standard and has meanwhile replaced it in essential parts. Filter testing is based on high-precision particle counting methods.
The ISO 29461 test standard standardises filter tests tailored to the intake air filtration of turbomachinery for the first time. The standard is currently divided into three parts. The first part, ISO 29461-1, provides a consistent filter class system for static intake air filters ranging from coarse dust filters to HEPA filters. A test in accordance with ISO 29461 Part 2 determines the water retention capacity of a supply air filter and its increase in air resistance when soaked. ISO 29461-3 will be adopted in 2024 and is dedicated to the topic of burst pressure.
The EN 779 standard "Particulate air filters for general ventilation" defined the test procedure for coarse and fine dust filters. The EN 779:2012 version valid from April 2012 until mid-2018 included the introduction of minimum efficiency levels for classes F7 to F9, and the renaming of classes F5 and F6 to M5 and M6. Since mid-2018, EN 779 has been completely replaced by the ISO 16890 standard in Europe.
Filter media used in dust removal machines is tested according to the SBM dust class DIN EN 60335-2-69 appendix AA. The maximum degree of penetration decides whether a filter material is classified as an L, M or H class.
ISO 16890 - Closer to reality
The new ISO 16890 enables the best filter solution
Towards a new classification of air filters for turbomachinery with the ISO 29461-1 standard
Test method for EPA / HEPA / ULPA filters
EN 1822 and ISO 29463
EN 779: 2012 Compact
The filter classification standard in overview