... with breath valve Standard: CE EN149 (FFP1, FFP2, FFP3), NIOSH, N95 elastic wearing nasal splint ART. NO.: DAC4-1OF VALVED ACTIVE ... acid vapor, such as H2S, SO2, H2, N2 and micron dust. Construction: Special 4-ply pleated design, high filtration and static ... carbon material to absorb. Silicon valve equipped to resist the dust. Application: Suited to auto building, ships building, paper manufacturing, ...