PM 2.5 Mask Filter Insert - 5 Layer
Five Layer Filtration technology keep away from a range of airborne contaminants
1. First layer of spunbond cloth filters micron-level dust;
2. Second layer filters industrial pollutants, automobile exhaust, second-hand smoke, and pollen allergens.
3. Third layer of activated carbon cloth filters micron-level dust;
4. Fourth layer offers filter density for smaller material.
5. Fifth layer of spunbond cloth filters out all kinds of harmful substances.
size: 4.7inch * 3.1 inch
Disposable supplies can not be washed or reused.
1 piece of filter is generally used for 3-7 days or 40hours