взрослый ребенок 5 слоев активировать угольный фильтр площадку рм2,5 pad 5ply активированный уголь для пыле хлопок mouth муфельной

adult child 5 layers pm2.5 pad 5ply activated carbon for dustproof cotton mouth muffle features: 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.