Face masks with valves do not stop the spread of the coronavirus and should not be used, the CDC says.
Masks help slow the spread of the coronavirus by acting as a simple barrier, blocking respiratory droplets in the air a person exhales and stopping them from spreading. Valves, however, allow for air to be exhaled through a hole in the material, meaning the droplets aren't blocked from spreading to others, the CDC says. Because these valves are one-way, droplets are blocked from being inhaled, but nothing is blocked when it is exhaled.
Instead, the CDC recommends people wear simple masks, which can be made from cloth, to slow the spread of COVID-19.
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