Filtration performance is further enhanced by the use of a state of the art multi layer pleating process. The multi layers provide an integral pre-filter and protection to the cellulose fiber media. Resulting in maximum dirt holding and increased durability to extend the filters life. The filters are manufactured to the most stringent production standards using the latest automated manufacturing equipment and the highest quality of materials. The cartridge is assembled with thermal weld technology making a one pieces cartridge construction for maximum integrity and strength. Extensive filter production knowledge and the most modern manufacturing facilities results in a top of the range, but still economic pleated cellulose fiber filter cartridge.