Five-layer filter cloth: As shown in the figure, there are 2 anti-sticking cloths, 1 filter cloth, 1 activated carbon and 1 high efficiency filter cloth. First layer of spunbond cloth filters micron-level dust; Second layer filters industrial pollutants, automobile exhaust, second-hand smoke, and pollen allergens. Note: 1. Filter insert can not be cleaned and should be replaced every 2-3 days. 2. When film or sticky sediment stains emerge, please replace the filter. 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