3 ms·
It seems literally to be designed to expel the air within the mask and replace it with external air. Which is the opposite of what most masks aim to achieve (co
by _-___________-_ 7y ago
It seems literally to be designed to expel the air within the mask and replace it with external air. Which is the opposite of what most masks aim to achieve (contain droplets within the mask to prevent them from reaching others), and would seem to increase the risk to people nearby.