While the N-95 respirator is able to filter 95 % of the very small airborne particles, the efficiency of the N-99 mask to filter such particles will be 99 %.
from The Hindu - National https://ift.tt/3aonvuX
Sunday, April 19, 2020
Coronavirus | Textile body develops high quality cloth to make ‘N-99’ masks https://ift.tt/eA8V8J
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