Features: 1) Filter media: cellulose, cellulose/polyester blend, polyester 2) Source of media: USA, Finland, Korea or China 3) Provides more space between filters than circular cartridges 4) Lowers velocity and reduces filter abrasion 5) Narrower cartridge width and convex side panels expand cross-sectional flow area in collector up to 76 percent 6) Quick-release access clamp on front of each cover allows easy filter maintenance. 7) Both the size of the cartridge and the shape of the caps are available in various specifications 8) All configurations are changeable to meet the optimum performance of your applications Construction: 1) Shape: Oval shape 2) Top cap: open steel plate, no rust 3) End cap: open or closed steel plate, no rust 4) Filter surface: various available 5) Inner core: galvanized mesh 6) Outer core: galvanized mesh or none 7) Gasket: specialty rubber to ensure airtight sealing