HEPA filter is applied to the filter diameter of <= 0.3 ~ 0.5um clean room and clean room, normal temperature and humidity, allowing the content of trace acids, alkalis, organic solvents, air filter, widely used in aviation, aerospace, electronics , pharmaceutical, biotechnology and other fields. (Types) Type: plate, box-type, (Frames) Frame: galvanized sheets, stainless steel sheets, galvanized steel and stainless steel plates, etc., (Materials) Material: super fine glass fiber fine glass fiber, PP, PTFE, separated layer material: aluminum foils aluminum foil, (Filtration effect) filtration efficiency: 99.995% (MPPS, PSL), (Thickness) Thickness: 220mm, 292 mm.