Possibility of sterilizing the filter up to 5 times, either by immersion in a 60% alcohol solution, at a temperature of 80°C for 20 minutes, with ozone, or UV. The smallest virus is 200 nanometers, nanofilters capture particles as small as 50 nanometers. Much longer lifespan, thanks to the nanofiltration material used and one inhalation and exhalation valve, the lifespan of the filter is approximately 4 times longer than that of conventional filtering materials for half masks and full-face masks.