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Mosby

(17,846 posts)
6. The valved masks were not designed for medical use
Sun Jul 26, 2020, 04:02 PM
Jul 2020

They are designed for construction, where you need protection from very small particulates.

The valve helps by allowing the moisture in your breath to easily flow out, without having to go through the medium.

When i wear one you can see large droplets inside the valve after a short time of use.

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