1. Dust masks have a certain filtering volume, more than its filtering capacity, it can not prevent dust. Therefore, for some places with high dust concentration, you should first carry out engineering renovation to control dust, reduce the dust concentration to below the allowable concentration, and then consider choosing to wear a dust mask.
2. Dust masks can't prevent dust even if they are not worn correctly. This includes not only wearing it according to the instruction manual to ensure that it is worn in the correct position and fit each time (no leakage), but also must be worn consistently during dust catching operations to detect signs of failure of the mask and replace it in a timely manner.
3. The mask should be labeled with the manufacturer's logo, certification level, compliance standards and product code, you should check clearly when choosing, choose quality-assured products.