Filter cartridge made of high quality and efficient wood fiber materials, learn from foreign counterparts in advanced production technology, combined with our factory in the experience of many years of actual use, carefully developed from. Folding filter cartridge production process, greatly increasing the air filter area, increasing the amount of ventilation, but also has a low drag, high filtration precision characteristics. The cover plate and the filter cartridge inside and outside grille plate made of high quality materials, electrochemical, with a good rust, corrosion resistance, but also both appearance and strength and good. Filter cartridges use good elasticity, high strength, anti-aging rubber sealing ring obturator (diamond shaped or conical), to ensure the filter cartridge tightness. Pleated filter cartridges take structure, with compact structure, small size makes dust, small footprint, filtration area big advantage; cartridge is stiff structure, in use with small elongation, clogging coefficient, filter low resistance, high filtration precision, long life characteristics.