pleated filter Large filter area Low initial resistance Large dust holding capacity Economical and practical Pleated pre-filter , cartonboard frame1 ) Application: Filter dust, pre-filter through air2 ) Type: Synthetic foldaway filter 3 ) Frame: Aluminum, paper or galvanized4 ) Media: Synthetic fiber5 ) Protect mesh: Alumnum mesh or spray iron mesh 6 ) En799 class: G2, G3, G4, F57 ) Average ...