3n is a composite filter screen made by the top filter material of 3M Group with the support of German patent technology, which is composed of high-efficiency dust filter cotton, coconut shell activated carbon and activated carbon fiber. It is one of the highest standard filters in previous household air purifiers. The reason why it is the highest specification filter in household air purifier is because it has less pollutant purification ability than ordinary filter. Ordinary filter can only filter common PM2.5, while 3N composite filter can purify PM0.003 micron pollutants. With the constant change of environmental pollution, the standard of air purification has gradually developed from PM2.5 to more accurate PM0.003, because most of them are high-risk carcinogens, such as benzene, alkanes, aromatic hydrocarbons and olefins. Most of them are distributed indoors, but there is no trace. Their volume in the air is much smaller than PM2.5, and the smallest can be as small as 0.003 micron, which is commonly known as PM0.003.
3N composite filter has a good reputation in the current market, and the user evaluation is higher than that of ordinary single-layer filter. Where there is basically no gap in the filter screen, anyone who has used an air purifier knows that the better the sealing performance of the filter screen, the stronger the purification ability.