A filter that separates impurities from the air through a dry filter element, such as a paper filter element. The air filters used in light vehicles (including cars and minicars) are generally single-stage. Its shape can be oblate or elliptical and flat. The filter material is filter paper or nonwovens. If the end cover of the filter element is metal or polyurethane, the shell material is metal or plastic. At the rated air volume flow rate, the original filtration efficiency of the filter element should not be less than 99.5%. Heavy duty vehicle due to poor working conditions, its air filter must be a majority. The first stage is the swirling prefilter (such as blade ring and cyclone tube), which is used to remove coarse and large particle impurities with a filtration efficiency of over 80%. The second stage is the microporous paper filter core (generally called the main filter core) with a filtration efficiency of over 99.5%. The main filter element is followed by a safety filter element that prevents dust from entering the engine during installation and replacement of the main filter element or when the main filter element is accidentally damaged. The material of safety core is mostly nonwovens, and some use filter paper.
　　This article is organized by dongguan oneness filtration technology co., LTD