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Filter filter air purifier.

Update:Aug 2018,16

The purification principle is that the built-in fan dra […]

The purification principle is that the built-in fan draws air, the air is pumped, and the filter is mechanically filtered. When the dust collides with the filter screen, the large layer of dust is blocked in the filter through the layer-by-layer barrier. However, some fine dust will pass through the mesh of the filter, which cannot effectively eliminate the PM2.5 hazard. Even the most efficient HEPA filters can only filter particles larger than 0.3 microns.
The filtering effect is also proportional to the noise. The better the filtering effect, the denser the filter, the smaller the particles that can be blocked, but the more difficult it is to pass the air. The fan power must be increased, and the fan power is increased. A large increase in noise will have a certain impact on rest. Moreover, the filter needs to be replaced regularly, and the cost of consumables is higher in the later stage, but if it is not replaced in time, it will form secondary pollution.