1. Increase the filtration area by 3-5 times, decrease the filtration wind speed greatly, and increase the dust removal rate by 99.99%. The length of the filter cartridge is short and there is large excess space, which is conducive to dust deposition. 4. The life of the filter cartridge is prolonged. 5. Venturi tube and cage frame are all exempted. 6, the filter elements are short and few, easy to install (top load), easy maintenance and replacement.