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An experiment conducted by an American engineer questions the effectiveness of valve masks in fighting the spread of COVID-19. According to his report, this type of mask does not contain the virus!
To stem the spread of the SARS-CoV-2 coronavirus, authorities recommend wearing a mask. Sometimes annoying, this accessory that is now part of our daily life unfortunately hides our facial expressions. Faced with these problems, some companies have recently announced clear masks equipped with a device that filters the air we inhale. However, it is clear that valve masks still dominate. Unlike a standard mask, this model is more comfortable thanks to the presence of a filter that allows you to breathe easily and sweat less.
Credits Pixabay
However, according to Matthew Staymates, a mechanical engineer at the Maryland National Institute of Standards and Technology, valve masks are unable to block droplet projection. They would therefore be ineffective in preventing the spread of the virus.
Images taken with high speed cameras
To reach this conclusion, the expert filmed the flow of air exiting a person’s mouth and nose on the basis of two types of masks: one with a valve and the other with an N95 mask. classic. To do this, he used high-speed cameras.
As reported by the Daily Mail, the images showed that worthless masks successfully filter out most of the droplets from exhaled breath, reducing the risk of Covid-19 transmission. The valve in turn allowed a jet of air laden with droplets to escape from the mask. As much as wearing a mask equipped with this device allows an infected person to transmit the virus to those around him.
“A noticeable difference”
“When you compare the videos, the difference is amazing”, commented Staymates. “These videos show how valves allow air to escape from the mask without filtering it, which defeats the purpose of the mask.”, He explained.
The expert mentioned in his report that he used only one valve mask model and that the effectiveness can vary from mask to mask. The ability to stop droplet projection would also depend on how the mask is mounted.
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