Airflow Dynamics When Wearing N95 Masks With and Without Valves

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This video, created using a light scattering technique, shows airflow dynamics when wearing an N95 mask with an exhalation valve (left) and without an exhalation valve (center). Masks with valves do not slow the spread of COVID and should not be worn for that purpose, according to the CDC.

Credit: Matthew Staymates/NIST
  1. SciTech Daily
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