When to change masks
Feb 20, 2020
1. The mask is contaminated, such as blood stains or droplets
2. The user feels that the respiratory resistance becomes larger
3. Damaged mask
4. Dust filter cotton, when the mask is in good contact with the user's face, when the user feels great resistance to breathing, it means that the filter cotton is full of dust particles and should be replaced
5. Under the condition that the mask is in good contact with the user's door, when the user smells the toxic substance, it should be replaced with a new one.
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