The prototype of the air filter is a respiratory protection device used by people to protect the breath. According to records, as early as the first century in Rome, people used hemp masks to protect them for a long time when they were purifying mercury. Air filters have also made progress, but they are mainly used as respiratory protection devices in some dangerous industries, such as the production of hazardous chemicals. In 1827, Bupeng discovered the law of movement of tiny particles, which gave people a further understanding of the mechanism of air filtration. The rapid development of air filters is closely related to the development of the military industry and the electronics industry in the 1950s. The United States has conducted in-depth research on the production process of glass fiber filter paper, which has improved and developed air filters. In the 1960s, HEPA filters came out; in the 1970s, HEPA filters using fine glass fiber filter paper as the filter medium were used for D. The filtration efficiency of 3 micron particles is as high as 99.9998. Since the 1980s, with the emergence of new test methods, the improvement of use evaluation and the improvement of the requirements for filtration performance, it has been found that there are serious problems with HE-PA filters, so higher performance ULPA filters have been produced. At present, countries are still working hard to study, and it is estimated that more advanced air filters will appear soon.

Significant progress has also been made in the design of the filter itself, the most important of which is the removal of partitions, that is, the development of filters without partitions. The partitionless filter not only eliminates the danger of the partition plate damaging the filter medium, but also effectively increases the filtering area, improves the overshaking efficiency, and reduces the airflow resistance, thereby reducing energy consumption. In addition, air filters have made great progress in high temperature resistance, corrosion resistance, waterproofing, and anti-bacterial aspects to meet some special needs.

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