CDC: Masks with exhalation valves, vents should not be worn to prevent spread of COVID-19

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A breathing protection mask of the category FFP3 of Moldex-Metric, a German producer of working protection clothes, is set up in Ludwigsburg, southern Germany, on March 12, 2020. – Due to the outspread of the coronavirus COVID-19, there is a strong demand on medical protective, especially of protection masks. (Photo by THOMAS KIENZLE / AFP) (Photo by THOMAS KIENZLE/AFP via Getty Images)

SAN FRANCISCO, Calif. (KRON) — The CDC recommends that people wear masks and face coverings in public settings to help prevent the spread of COVID-19.

Masks with exhalation valves or vents should not be worn to prevent the spread of COVID-19, the CDC said Friday.

Wearing a face mask helps prevent respiratory droplets from traveling into the air and onto other people when the person wearing the masks coughs, sneezes, talks or raises their voice — also known as source control.

But masks with one-way valves or vents allow air to be exhaled through a hole in the material, which can result in expelled respiratory droplets that can reach others.

These type of masks don’t prevent the person wearing the mask from transmission COVID-19 to others.

Masks are most likely to reduce the spread of COVID-19 when they are widely used by people in public settings.

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