1. The larger the extension area, the better

The extended area is the total area of ​​the folded air filter material after it is spread out into a plane, that is, the total area used to filter dirty air. For two purifiers with the same ventilation volume, the one with the larger extension area will have a slower wind speed through the filter, and the filtration efficiency will be better.

 

2. The smaller the resistance, the better

The smaller the resistance of the filter material, the more labor-saving the work of the fan of the purifier, the advantage is that the sound is small, and it also saves electricity. It is worth noting that most people tend to think that resistance is inversely proportional to filtration efficiency, but in fact it is not completely the case. The development of new technology is making filter materials develop in the direction of low resistance and high efficiency.

 

3. The antibacterial filter is more reliable

The purifier repeatedly filters indoor air with a certain humidity. Bacteria are easily attached to the filter material, and then grow and diffuse into the room again with the airflow, resulting in secondary pollution. If the filter has the function of inhibiting the growth of bacteria in this province, it can reduce or even avoid secondary pollution.

 

4. Appearance details

The appearance details can indirectly reflect the manufacturer's production technology level. For ordinary consumers who lack professional testing methods, observing the appearance details of the air filter is a simple and effective means. Whether the frame is flat, which is conducive to sealing, and the uneven frame is likely to cause air leakage; whether the paper surface of the filter material is flat and tight. In addition, you can also distinguish the quality of the filter material by folding the filter paper in half. A good quality filter paper can restore its original shape by virtue of its own elasticity, but a poor quality filter material will have obvious creases.