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[–]fusir[S]0 points
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(edited ago)
Instead even single layer cloth masks show up on schlieren with less projection.
Whether projection matters or not is up for reasonable debate because everything lingers in the air and circulates through hvac. But if the idea is to keep someone from breathing on you directly then the ones with the exhalation port are essentially projecting breath through a nozzle, while people with single layer cloth masks are stopping projection.
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[–] fusir [S] ago (edited ago)
Instead even single layer cloth masks show up on schlieren with less projection.
Whether projection matters or not is up for reasonable debate because everything lingers in the air and circulates through hvac. But if the idea is to keep someone from breathing on you directly then the ones with the exhalation port are essentially projecting breath through a nozzle, while people with single layer cloth masks are stopping projection.