There are several key points. One is to wear it correctly. Do an air tightness test after wearing it, that is, cover the air inlet of the mask with both hands, and then inhale to see if the mask has collapsed. If it is difficult to inhale, the face has collapsed to the face, indicating good tightness. On the contrary, it needs to be adjusted. Then, select the filter box to filter cotton. If it is dustproof, choose 209 1p 10. If there is dust and gas, you need to choose the corresponding filter box to use with 5N 1 1 filter cotton. This configuration will definitely have a good protection effect.
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