DESC: A large fan draws air into the unit. A pre-filter traps the large particles, then the air enters an internal ionization chamber where airborne particles are charged with positive ions. The positively charged particles are drawn to the negatively charged filter plates in the following chamber. The open structure of the filter plates allows for a silent flow of clean air. The end result is a highly efficient, extremely quiet air cleaner with a superior CADR rating over traditional tightly woven HEPA filter units.