The Austin Air Healthmate Plus consistently is rated as one of the better room air cleaners on the market, and at a reasonable price, it is one of the best value products out there. The Healthmate Plus utilizes a 360 degree progressive filtering system. The four-stage filtering process involves two pre-filters (one for large particles, and one for medium sized particles), an Activated Carbon filter impregnated with Potassium Iodide which removes chemicals, gases, and odors, and a True Medical Grade HEPA that removes harmful micro-organisms. The unit comes with four casters that allow for easy movement. Austin Air offers a five-year limited warranty on the Healthmate Plus. The Healthmate Plus requires little maintenance compared to other similar models.