This kind of N95 mask can actually spread the coronavirus - Los Angeles Times
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Filtering Facepiece Respirators with an Exhalation Valve | NIOSH | CDC
A Certain Type of N95 Mask May Do More Harm Than Good
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Respirator Exhalation Valve Research | NIOSH | CDC
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3M 8511 N95 Particulate Disposable Respirator With Cool Flow Exhalatio
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