Filters are realised through liquids and air filtration. They are dry filters, obtained through polyester orifice plate (from 10 to 80 orifice per inch PPI) or through special filter paper or polyester with a progressive density. KC filter P15 500S filter T3 290 filter BF/1 filter BZ/01 filter PPI Fields of application Electricity sector Electro-medical sector Mechanical engineering sector Air handling sector