It is necessary to see the degree of cooperation between the vacuum cleaner filter and the equipment, calculate a reasonable resistance according to the air volume of the fan, and find the balance point of the efficiency and the resistance to make an air filter that is ideal. However, in the actual use process, our H13 HEPA filters manufacturers also need to take into account the airtightness of the equipment. If the equipment has air leakage, its primary filtration efficiency will be reduced. In terms of air purifier filters, we generally use PU cotton, EVA and rubber and plastic to increase the edge sealing. These materials are more elastic, which can better adapt to the equipment tolerance and increase the sealing performance. Of course, the silicone frame air filter can also effectively improve the sealing. However, the relative cost will be high, and the silicone frame will need to be opened in the early development process. But after the order quantity goes up, the cost evenly spread to each filter is not high. The quality of the filter is improved and it is not easy to be imitated. It is also better for brands.