It is part of every automotive combustion engine. The main job of the filter will be purifying a volume of air from dusts and particles. It's job is to suck all air dust and prevent getting it to the combustion chamber. The most commonly used car filters are dry filters. They mainly consist of a housing and a replaceable filter cartridge. There are three types of air filters. They are cotton, paper or mesh. It is a consumable item, so it requires regular replacement and inspection.