The first thing to be clear is that all kinds of dust, TVOC, formaldehyde, no matter solid, liquid, bacteria, pollen, as long as they can be classified as particulate matter, the filter will treat them the same. Totally blocked.
The fibers are intricately arranged within the fiber layer of the filter, forming countless grids. When a particle of a certain size moves along the airflow streamline just to the vicinity of the fiber surface, the particles intercepted and deposited on the surface of the fiber. This effect called the interception effect, and the sieve effect belongs to the interception effect.
When the airflow filled with various dusts passes through the HEPA fiber layer, which is inside the car air purifier, due to the complex arrangement of the fibers. The airflow streamline must turn violently many times. When the mass of the particles is large, so they leave the streamline and approach the fiber. They collide with the fiber. After sedimentation, the particles intercepted by the combined action of these two effects.
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