5 слой рм2,5 activate угольный фильтр famask pad прокладка 3 слойный для к fan99, kn90, kn100, kf94, kf99 ,, 3 слоя нетканые

famask pad gasket 3 ply for k fan99,kn90,kn100,kf94,kf99,, 3 layers non-woven.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.