FIELD: human vital needs satisfaction.
SUBSTANCE: filtering device includes the body of the mask and the corrugated layer. The corrugated layer is made with a plurality of folds and is mounted on the mask body. The surface area of the corrugated layer exceeds the surface area of the mask body. Thus, the filtration area of the filtering device is effectively increased.
EFFECT: filter effect and the air permeability of the filtering device are further improved.
19 cl, 18 dwg
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