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Universal mask use is necessary to limit the spread of the coronavirus, especially in the middle of the lock, but exhalation valve masks are not suitable for “slowing down” Covid-19, according to a new American scientific study.
The researchers, led by mechanical engineer Matthew Steamets of the US National Institute of Standards and Technology (NIST), who specializes in evaluating the effectiveness of different masks, published their findings in the journal Physics of Fluids. Video recording of a special type: air circulation through N95 masks with and without valve.
As Steimic said, “The difference is striking.” The valves allow air to escape from the mask without leaking, defeating the purpose of the mask. “So, as you mentioned, if you see someone wandering around the supermarket or pharmacy with a valve mask, it is better to keep proper distances.
Valve masks make breathing easier and thus make you more comfortable for a long time. They are originally made to filter inhaled air (but not exhaled) and thus protect the user, e.g. Eg workers in dust and chemical construction projects or hospital nurses of patients with viruses and germs.
However, the masks in the case of the coronavirus, according to the official medical guidelines from around the world, must first protect others and therefore slow the spread of the pandemic, retaining potentially infected particles from the support of the mask. Even asymptomatic people should wear the mask, because they can unknowingly be carriers of the coronavirus.
“I don’t wear a mask to protect myself as much as others, because I can be asymptomatic and spread the virus without knowing it.” But if I wear a mask with a valve, it doesn’t help at all, “Steimeic said. He also noted that even masks without valves worn loosely, not applied to the face as much as possible, allow some of the exhaled air to escape over the edges of the mask and possibly infect others.
Source: skai.gr
