5 слой рм2,5 активировать фильтр углерода три слоя маски pad mask прокладка замена раунда

three layers mask pad mask gasket replacement round.1.the first layer: high efficient filter cloth filter the dust of micron.2.the second layer: meltblown cloth to filter industrial pollutants, automobile exhaust, second-hand smoke pollen allergies.3.the third layer: high efficient filter cloth filter benzene and a smaller function of filtering dust microns.4.the fourth layer: activated carbon cloth filter density, sma.