The interpretation I have for the mask is that we say y at any distance = mask rating (95 or 99).
This simple conversion does not work, since the drop of particle concentration over a certain distance is not fixed and drop size is not fixed. Under very favorable conditions you may get an infectious dose over 60 feet though that is quite unlikely.
But those filter materials may be something of a bottle neck too (and clearly do compete with providing masks to the medical workers.
That is my point. We should start manufacturing masks and filter material en masse NOW so we can provide everyone with a high quality mask in 2 to 3 months. Noone does this at the moment and what is produced is wasted on crappy one way products even most professionals do not use correctly.
This simple conversion does not work, since the drop of particle concentration over a certain distance is not fixed and drop size is not fixed. Under very favorable conditions you may get an infectious dose over 60 feet though that is quite unlikely.
That is my point. We should start manufacturing masks and filter material en masse NOW so we can provide everyone with a high quality mask in 2 to 3 months. Noone does this at the moment and what is produced is wasted on crappy one way products even most professionals do not use correctly.