Name: Why simple cloth masks without valves are better at fighting the spread of covid-19
Brand: washingtonpost.com
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Why simple cloth masks without valves are better at fighting the spread of covid-19

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This article was published more than&nbsp;2 years agoCommentGift ShareThose 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, 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.AdvertisementMedical masks, you’ll notice, do not have valves.In its guidelines for mask-wearing, San Francisco stipulates that .“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 says.The Centers for Disease Control and Prevention 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.angela.fritz@washpost.comThe latest: , a strategic shift that puts more of the onus on individuals, rather than on schools, businesses and other institutions, to limit viral spread.Variants: BA.5 is the most recent omicron subvariant, and it’s quickly become the dominant strain in the U.S. , and why vaccines may only offer limited protection.Vaccines: For people under 50, while the Biden administration works to roll out shots . Immunizations for became available this summer. Here’s by your prior infections and booster history.Guidance: CDC guidelines have been confusing — if you get covid, here’s . We’ve also created .Where do things stand? See the latest coronavirus numbers and . The is behind much of the recent spread.For the latest news, . CommentsGift ArticleTOP STORIESRecommended RecipesLooking for inspiration? Try these recipes to prepare dishes with confidence.Try a different topic or to save your preferences

This article was published more than&nbsp;2 years agoCommentGift ShareThose 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, how they work: inhaled air...

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Angela Fritz

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Why simple cloth masks without valves are better at fighting the spread of covid-19

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