Are Masks With Valves Less Effective?

There’s no clear difference between effectiveness of masks with and without valves.

Some of the highest performing masks have valves.

See our test graphics below:

The graphics combines Smart Air’s test data and  Richard Saint Cyr MD’s fit test results. 

Click here to read the original answer on Quora: https://www.quora.com/N95-mask-with-a-valve-better-than-one-without

 

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