A current list of DIY masks for the COVID-19 pandemic ...
DIY Cloth Face Mask. ... Rather than the percentage of effectiveness, I would like to see what the smallest particle size each material will filter, say as in microns. This was given for the Halyard 6000 at 3.0 microns. It is my understanding that COVID-19 is 0.1 micron in diameter. If that is true then it doesn’t sound like any of these ...