DIN EN ISO 29463-4:2018-02

The series ISO 29463 contains requirements, fundamental principles of testing and the marking for high-efficiency particulate air filters with efficiencies from 95 % to 99,999 995 % that can be used for classifying filters in general or for specific use by agreement between users and suppliers. DIN EN ISO 29463-4 specifies the test procedure of the 'scan method', considered to be the reference method, for determining the leakage of filter elements. It is applicable to filters ranging from classes ISO 35 H to ISO 75 U. It also describes the other normative methods, the oil thread leak test (see Annex A) and the photometer leak test (see Annex B), applicable to classes ISO 35 H to ISO 45 H HEPA filters, and the leak test with solid PSL aerosol (see Annex E). It is intended for use in conjunction with DIN EN 1822-1 rev, DIN EN ISO 29463-2, DIN EN ISO 29463-3 and DIN EN ISO 29463-5.