When does the mask need to be replaced?

2021/03/09

1. The mask(5mm nose wire) is contaminated, such as stains or droplets and other foreign objects

 

2. The user senses that the breathing resistance increases. Dust-proof filter cotton, when the mask is in good contact with the user’s face, when the user senses that the breathing resistance is large, it means that the filter cotton is already covered with dust particles and should be replaced with a new one.

3. The mask is damaged