1. Passive adsorption filtering air purification principle.

Passive air purification is to use a fan to draw air into the machine and filter the air through the built-in filter screen, which can mainly filter dust, odor, disinfection, etc. This filter screen type air purifier mostly uses HEPA filter screen+active carbon filter screen+photocatalyst (cold catalyst, faraway catalyst)+ultraviolet disinfection+electrostatic adsorption filter screen to treat air. Among them, HEPA filter screen has the function of filtering dust particles, and other activated carbons are mainly used to absorb odor. Therefore, it can be seen that the working principles of air purifiers with fan filter screen, photocatalyst, ultraviolet, static electricity and other different labels and seemingly very confused on the market are basically the same, they are all passive adsorption filtering air purification.

  1. Active air purification principle.

The fundamental difference between the active air purification principle and the passive air purification principle is that the active air purifier gets rid of the restrictions of the fan and filter screen. Instead of passively waiting for the indoor air to be pumped into the purifier for filtering and purification, and then discharging it through the fan, it effectively and actively releases purification and sterilization factors into the air through the characteristics of air diffusion, Arrive at all corners of the room to purify the air without dead space. At present, the relatively mature active purification technologies mainly use negative oxygen ions as the purification factor to treat the air and ozone as the purification factor to treat the air. These two are typical air purifiers based on active purification principle.

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