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hitmyspot , 10 months ago Not only that but those percentages are for a given particle size. They will both stop 100% of ping pong balls, for instance. As mentioned in yoher comments, the virus is usually in aerosol, microscopic droplets of varying size.
Not only that but those percentages are for a given particle size. They will both stop 100% of ping pong balls, for instance. As mentioned in yoher comments, the virus is usually in aerosol, microscopic droplets of varying size.