2011DIN EN 1822-5:2011 High efficiency air filters (EPA, HEPA and ULPA) - Part 5: Determining the efficiency of filter elements; German version EN 1822-5:2009
1970DIN EN 1822-5 E:2008-04 High efficiency air filters (EPA, HEPA and ULPA) - Part 5: Determining the efficiency of filter elements
2000DIN EN 1822-5:2001 High efficiency particulate air filters (HEPA and ULPA) — Part 5: Determining the efficiency of filter element