Air filter element is a kind of filter, also known as air filter cartridge, air filter, style, etc. It is mainly used for air filtration in engineering locomotives, automobiles, agricultural locomotives, laboratories, sterile operating rooms and various precision operating rooms.

The engine should inhale a large amount of air during operation. If the air is not filtered out and the suspended dust in the air is sucked into the cylinder, it will accelerate the wear of the piston group and the cylinder. Large particles entering the piston and the cylinder will cause a serious "pull cylinder", which is particularly serious in dry and sandy working environments. The air filter is installed in front of the carburetor or intake pipe to filter out dust and sand in the air and ensure that sufficient and clean air is entered in the cylinder.
空氣濾芯是一種過濾器，又叫空氣濾筒、空氣濾清器、風格等。主要用于工程機車、汽車、農用機車、實驗室、無菌操作室及各種精密操作室中的空氣過濾。
發動機在工作過程中要吸進大量的空氣，如果空氣不經過濾清，空氣中懸浮的塵埃被吸入氣缸中，就會加速活塞組及氣缸的磨損。較大的顆粒進入活塞與氣缸之間，會造成嚴重的“拉缸”現象，這在干燥多沙的工作環境中尤為嚴重。空氣濾清器裝在化油器或進氣管的前方，起到濾除空氣中灰塵、砂粒的作用，保證氣缸中進入足量、清潔的空氣。