This comment should NOT be downvoted. We are not comparing this device to somebody wearing a mask. We're comparing two mask-less people - one with, one without

This comment should NOT be downvoted. We are not comparing this device to somebody wearing a mask. We're comparing two mask-less people - one with, one without this device. In which case the quantity of virus expelled in their breath is equal, but the distribution of air is different. How this affects spread of disease is far from obvious. It could spread more: - it reaches more people - it reaches people faster It could spread less: - much more diluted - will dry droplets faster - it works as a portable filter which filters part of the volume of air in that space