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Washington, November 12: Scientists have used high-speed videos of air flow to show why masks with exhalation valves do not slow the spread of COVID-19. The researchers from National Institute of Standards and Technology (NIST) in the US created the videos which show airflow patterns through masks with and without exhalation valves.
"When you compare the videos side by side, the difference is striking," said NIST research engineer Matthew Staymates, corresponding author of the study published in the journal Physics of Fluids.
"These videos show how the valves allow air to leave the mask without filtering it, which defeats the purpose of the mask," Staymates said.
Exhalation valves, which make masks easier to breathe through and more comfortable, are appropriate when the mask is meant to protect the wearer, the researchers said.
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