High Performance pleated panel air filters for HVAC & General Ventilation used as pre filtration to extend the life of Fine Filters. Features: Low initial pressure drop Disposable/Washable Maintenance Free Compact Design Frame Material:Cardboard/Galvanised Iron/Aluminium/Stainless Steel Media: Synthetic/HDPE/Glass Fibre Filter Class EN779: G2/G3/G4 Average Arrestance(%): 80/90/95