Using an imaging system that "causes differences in air density to show up on camera as patterns of shadow and light," the videos demonstrate how large quantities of unfiltered air exit vented masks. The hole in the material may allow your respiratory droplets to escape."Īs it turns out, that's putting it lightly. To illustrate just how flawed these masks are, Matthew Staymates, a research engineer with the National Institute of Standards and Technology (NIST), created a series of videos comparing vented and non-vented masks. The agency explains that "this type of mask may not prevent you from spreading COVID-19 to others. The Centers for Disease Control and Prevention (CDC) has issued a similar warning, and has included vented masks on their own list of masks to avoid.
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