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  • superior 3 layers blue medical mask flu prevention from zhengzhou

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The filtration efficiency and protective ability of a face mask is compromised when the mask becomes wet, torn or dislodged. Generally speaking, the higher protection value of a mask the longer it will maintain filtration; however, there is no set rule for how long a mask should be worn as it depends on humidity levels, respiration rate, nasal discharge, talking, etc.Amazon Best Sellers: Best Medical Face MasksDiscover the best Medical Face Masks in Best Sellers. Find the top 100 most popular items in Amazon Industrial & Scientific Best Sellers.Why do surgical masks have a blue side and white side , superior 3 layers blue medical mask flu prevention from zhengzhouMar 25, 2020 · A surgical mask is correctly worn only one way. The blue (Sometimes green - depending on the vendor) side is liquid repellant to keep fluids from leaking through into your nasal cavity. It is worn on the outside. If its a standard 3 ply mask both, superior 3 layers blue medical mask flu prevention from zhengzhou

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