FIELD: cleaning air. SUBSTANCE: filtering material consists of the layer of polydispersion electrically charged ultra-fine fibres made of copolymer of styrol with methyl methacrylate and acrylonitrile. The filtering material contains, by mass, 20% of fibres made of methyl methacrylate and acrylonitrile of 6-10 micro meters in averaged diameter and 70-80% of acrylonitrile. EFFECT: improved quality of filtering. 1 tbl
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