Air filtration masks
2020 Jul 04
Air filtration masks are the most widely used in daily work.The structure of an air filter mask should be divided into two parts.
One is the main body of the mask, which can be simply understood as a shelf of the mask.
The other is the filter material part, including the filter cotton used for dustproof and chemical filter box used for poison prevention.Protection series: mainly divided into three levels of P.R.N
