First layer of spunbond cloth filters micron-level dust.
Second layer filters industrial pollutants, automobile exhaust, second-hand smoke, and pollen allergens.
Third layer of activated carbon cloth filters micron-level dust.
Fourth layer offers filter density for smaller material.
Fifth layer of spunbond cloth filters out all kinds of harmful substances.
Filter size: As the picture show
1. Filter insert can not be cleaned and should be replaced every 3-4 days
2. When film or sticky sediment stains emerge, please replace the filter.