The principle of action of the pinhole filter is to utilize the screening effect of the material to intercept the airborne particles through the fine aperture. The effectiveness of this interception depends on the mesh and pore size of the material. Generally speaking, the more mesh and the smaller the pore size, the better it is at filtering out fine particulate matter.
However, pinhole filters are not a complete substitute for other types of air purification equipment. For smaller particles, such as dust and pollen, it is recommended to use filtering materials that are 10 microns or larger; for tiny particles such as bacteria and viruses, more efficient filtering materials and technologies are needed for effective removal. In addition, improper use or insufficient regular cleaning can lead to a decrease in the effectiveness of pinhole filters. Therefore, when using a pinhole filter, it needs to be properly installed and maintained according to the instructions to ensure its effectiveness and safety.
Besides pinhole filters, there are many other air purification devices, such as HEPA filters and formaldehyde removers, that can also be used to improve indoor air quality. It is most effective to choose the right equipment according to the specific needs and actual situation.