The mask is used to filter the air in and out of the wearer's mouth and nose, and has achieved the purpose of blocking harmful gases, dust and droplets.

During the epidemic of novel coronavirus pneumonia, it is effective to prevent virus infection by choosing and using masks properly.

KN95 is a Chinese standard mask.

The masks are made of three layers of non-woven materials, and the front and back sides need to be distinguished, otherwise they cannot be worn correctly, and the protective effect that the masks should have lost.

This is also the case when wearing a mask, which makes people feel annoyed Today, I will teach you a little trick, so that you are no longer bothered by the fogging of your glasses.

he filtration efficiency of oily particles must be greater than 95%. Among them, the value of 95% is not the average value, but the minimum value, so the average value of actual products is mostly set above 99%.