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![](picture/2009101611554272943.jpg)
filter layer: activated carbon exhalation valve
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![](picture/2009101611562652145.jpg)
fabric: PP non-woven cloth filter layer: static deal fringe seal avoids open layer around the adges
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![](picture/2009101611580892983.jpg)
fabric: non-woven cloth Lightweight construction
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![](picture/2009101611585614184.jpg)
fabric: soft non-woven cloth filter layer:high efficient melt blown web
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