... and supply these filters in a range of filtration grades – G3, G4, F5, F6, F7, F8, and F9, (EU3, EU4, EU5, EU6, EU7, EU8, EU9) , which may ... pockets frame sizes (20mm and 25 mm header frames).Features: G4 Bag Filters are available in efficiencies of 90% on 5 ...