Each of our face masks comes with two disposable Nano filters.
Additional Nano filters can be purchased. This item includes a set of 5 Nano filters.
These Nano filters have been specially imported from Korea, complete with laboratory testing certification. Tested with NaCI aerosol at inhalation flow rates of 95 litres/min and average particle size of 0.6 micrometer, these Nano filters have a particle filtration efficiency in excess of 90%. This is, however, not medical grade filter/face mask.