Aluminium alloy frame, G4 panel filter, material is synthetic fibre. Application: Some high temperature air cleaning equipments, especially in electronic,semiconductor mechanical ,pharmaceutical ... ) Y11(EN1822):≥95% MPPS(99% 0.3um) Y12(EN1822):≥99.5% MPPS(99% 0.3um) H13(EN1822):≥99.95% MPPS(99 ... /22019.0H13AKF-GH13Y-B04-1501220*610*1502000/220 G4 pre Air Filter