There are two types of air filters, dry and wet.
It is a filter that separates impurities from the air through a dry filter, such as a paper filter. The air filters used in light vehicles (including cars and minicars) are generally single-stage. Its shape is flat circle or ellipse and flat plate.
Including oil-immersed type and oil bath type. Oil-immersed filter is used to separate impurities from the air through an oil-immersed filter core. The filter core material includes wire fabric and foaming material.