There are several ways to classify masks. Usually according to their structure and working principle, masks can be divided into two categories, i.e., air-filter masks and gas-style masks.

For air-filter masks or simply called filter masks, its working principle is to filter air which contains harmful substances through filter media of a mask and then inhale clean air.

Gas mask is the type of mask which isolates harmful substances from clean air through the dynamic action, such as air compressors, compressed gas cylinder devices, and delivers clean air via catheter to person's face for people to breathe.

Filter mask is most widely used in our daily work.The structure of a filter mask should be divided into two parts, one is the mask body, we can simply regard it as a mask shelf; the other is the filter parts, including dust-proof filters cotton, as well as anti-virus chemical filtration boxes. Therefore, for the choice of filter masks, products that provide you the following convenience that you can use the same kind of mask body, when you need dust-proof in the dust operating environment , make the mask accompanied by corresponding filter cotton, so you wear a dust-proof mask; When you need carry out anti-virus in the toxic environment, replace filter cotton with the corresponding chemical filter box, so it becomes an anti-virus mask, or according to what your work requires to provide more combinations.

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