3M 9920H PFF2 manufactured by 3M

Check out the results here: [ Ссылка ]
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Testing Methodology: In these videos we test mask breathability and filtration on our Particulate Filtration Efficiency Machine (PFE).

Find out more:
•The Four Things to Look for in a Mask: [ Ссылка ]
•How Does a PFE Machine Work: [ Ссылка ]

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