Global Statistics

All countries
160,059,912
Confirmed
Updated on May 11, 2021 4:36 pm
All countries
138,727,314
Recovered
Updated on May 11, 2021 4:36 pm
All countries
3,324,418
Deaths
Updated on May 11, 2021 4:36 pm

Global Statistics

All countries
160,059,912
Confirmed
Updated on May 11, 2021 4:36 pm
All countries
138,727,314
Recovered
Updated on May 11, 2021 4:36 pm
All countries
3,324,418
Deaths
Updated on May 11, 2021 4:36 pm

Why simple cloth masks without valves are better at stopping the spread of COVID-19

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Those face masks you see with coin-sized valves on the front may look intriguing but they are not as good at preventing the spread of the novel coronavirus as the seemingly lower-tech, non-valved masks.

Some masks designed for hot, dusty construction work — where the intent is to filter out dust before it hits the wearer’s lungs — have “exhaust” valves that allow the exhaled air to flow out more easily, to keep the mask-wearer cooler.

The 3M company, which makes valve masks for such occupations, illustrates on its website how they work: inhaled air is filtered through the fabric part of the mask, and hot, humid exhaled air goes out through the valve. The system may be what you want when tearing out a kitchen for remodeling, but the valve defeats the purpose when you’re trying to slow the spread of a virus.

Public health experts have been recommending mask-wearing to prevent respiratory droplets from spreading into the air when you exhale, speak, cough or sneeze, and the valves allow those droplets through.

Medical masks, you’ll notice, do not have valves.

“Any mask that incorporates a one-way valve (typically a raised plastic cylinder about the size of a quarter on the front or side of the mask) that is designed to facilitate easy exhaling allows droplets to be released from the mask, putting others nearby at risk,” the order says.

The Centers for Disease Control and Prevention recommends simple cloth masks for the public to prevent the spread of covid-19. A few layers of cotton prevent most of the potentially infectious respiratory droplets from escaping into the air around you, and they are also much cooler than the form-fitting N95 masks.

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