Air filters usually have two kinds of paper and oil bath. Paper filter has been widely used because of its high filtration efficiency, light weight, low cost and convenient maintenance. The filter efficiency of the paper filter element is as high as 99.5%, and the filtration efficiency of the oil bath filter is 95 - 96% under normal conditions. The air filter widely used on cars is paper filter, and it is also divided into two types: dry and wet. For dry filter core, once the oil or water is immersed, the filtration resistance will increase sharply, so avoid contact with water or oil when cleaning, or new parts must be replaced.
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