BS EN 1822-1:2019 High efficiency air filters (EPA, HEPA and ULPA) Classification, performance testing,
UNE EN 1822-1:2020 High efficiency air filters (EPA, HEPA and ULPA) - Part 1: Classification,
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DIN EN 1822-1:2019 - High efficiency air filters (EPA, HEPA and ULPA) - Part 1: Classification, performance testing, marking; German version EN 1822-1:2019