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


The out-breathing valve of a breathing protection mask of the category FFP3 is checked by an employee at the production line at Moldex-Metric, a German producer of working protection clothes, in Walddorfhaeslach, 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.


Copyright 2020 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

State Cases State Deaths

Latest Videos

More Video

More Local News

3-Day Forecast

Trending Stories