Are face shields or masks with exhalation valves better to

Are face shields or masks with exhalation valves better to prevent the spread of COVID-19?

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Play, download and edit the free video Are face shields or masks with exhalation valves better to prevent the spread of COVID-19?.

This video is based on the study by
Verma S, Dhanak M, Frankenfield J. Visualizing droplet dispersal for face shields and masks with exhalation valves. Physics of Fluids. 2020 Sep 1;32(9):091701.

Read this article & other compilation of COVID-19 research insights at https://zenodo.org/record/4017113

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