Don’t wear masks with valves, CDC says

People should wear masks to prevent the spread of COVID-19, but not those with exhalation valves or vents, the Centers for Disease Control and Prevention says.

Masks with these one-way valves are intended for use in construction work, allowing users to breathe in filtered air and exhale warm, moist air through the valve, according to The Washington Post. These valves reduce heat and moisture inside masks, making them more comfortable to wear for long periods.

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