New Airflow Videos Show Why Masks With Exhalation Valves Do Not Slow the Spread of COVID-19 | NIST
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Face Shields and Masks With Exhalation Valves Ineffective at Preventing SARS-CoV-2 Spread | Technology Networks
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You may want to ditch that valve face mask: The pros and cons - ABC News
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Respirator Exhalation Valve Research | NIOSH | CDC
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Why the CDC says you shouldn't use masks with exhalation valves - YouTube
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