Guangzhou Verygood Environmental Equipment Co. Ltd., of Guang-zhou, China, introduces pleated filters constructed of corrugated media around a high-strength, polypropylene center core with over 4 square feet per standard 9-3/4?? cartridge. It provides increased surface area and strength, which results in extended life. An external netted sheath provides extra support to protect against system pulsating. End caps are fused to the cellulose media that prevents bypass and forms a gasket sealing area.