The powerful Machflow; Plus hand dryer incorporates a low energy, high pressure, adjustable motor that allows you to choose noise levels between 67 to 74 dBA. It includes a HEPA filter media that filters out up to 99% of the solid particles in suspension (pollen, dust mites, tobacco smoke, etc.) significantly improving air quality as well as an ionizer ("Ion Hygienic" technology) that neutralizes viruses and bacteria thanks to the negatively charged particles it emits, helping to maintain the user free of harmful microorganisms.