Historical
BS EN 1822-5:2000
High efficiency air filters (HEPA and ULPA). Determining the efficiency of filter element (British Standard)
This European standard applies to high efficiency particulate air filters and ultra low penetration air filters (HEPA and ULPA) used in the field of ventilation and air conditioning and for technical processes, e.g. for clean room technology or applications in the nuclear and pharmaceutical industry.
British Standards Institution [bsi]