Division of high-efficiency filters in terms of efficiency

The standards according to which HEPA filters are tested are PN-EN1822: 2012 and ISO 14644-3 – PN-EN1822: 2012 – concerns methods of testing parameters, testing, and classification of EPA, HEPA, and ULPA filters at the manufacturers of these filters. – ISO 14644-3 – refers to the test method related to activities carried out in cleanrooms and clean zones to meet the requirements of the classification of air purity, other cleanliness factors, and related controlled conditions.