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Side. but it reduces the number that goes through. >> this professor says the screens reduce the droplet concentration by about 80%, so the viral load is much lower. and the cough stream may not go as far with the screen. when we visited this lab earlier in the pandemic to test the power of a cough without a plexiglass screen, droplets travelled as far as 12 feet with nothing to stop them. but even with the screen, lighter aerosoized droplets can accumulate in the air. it has to be a high quality mask. when we tried a simple cloth mask, this happened. >> 3, 2, 1. >> reporter: most of the dropl...

Side. but it reduces the number that goes through. >> this professor says the screens reduce the droplet concentration by about 80%, so the viral load is much lower. and the cough stream may not go as far with the screen. when we visited this lab earlier in the pandemic to test the power of a cough without a plexiglass screen, droplets travelled as far as 12 feet with nothing to stop them. but even with the screen, lighter aerosolized droplets can accumulate in the air. >> they can linger for seven, eight minutes. >> reporter: the professors found masking can help stop the spread when used alo...

Screen traps most of the larger particles so the person on the other side may avoid a direct hit, but the smaller particles still escape around the sides and over the top. >> the passage of the top to the other side, but it reduces the number they go through. >> professor says the droplets rekus the concentration by 80% so the viral load is much lower and the cough stream may not go as farther with the screen. when we visited the lab earlier in the pandemic to test the power of a cough without the screen, droplets traveled as far as 12 feet with nothing to top them. but even with the screen, l...