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The first layer: spunbond cloth, filter the dust of micron The second layer: to filter industrial pollutants, automobile exhaust, second-hand smoke pollen allergies The third layer: activated carbon cloth, benzene and a smaller function of filtering dust microns The fourth layer: filter density, smaller material The fifth layer: Spunbond cloth, filter out all kinds of harmful substances; Application: hospitals, out, site, tourism, colds, operating workshops, farms, haze weather, cold and warm Tips: Plug-in filter can not be cleaned, it is recommended 1-2 weeks to replace a; The filter oil on the film or with sticky sediment stains are more, please replace the filter.