AirSafe - Model VX400M - Patented Filtering System - Brochure

It is necessary to protect HEPA filters from aerosol’s high moisture. All kinds of dry filters get wet when invested by a fluid containg water, to dry off only later by evaporation. For this reason, after a number of work cycles, microfibers are no longer able to filter smaller particles. As a fact, filters literally wear out opening the way and making useless the filtering section without providing malfunction signals.