Hamilton Beach designed the tower in plastic and metal. The magnetic front panel softens noise for quiet operation. Energy Star- qualified, the purifier best accommodates medium- sized rooms up to 180 square feet in area. Three speed settings allow the user to customize purification for the particular room's needs. The purifier also benefits from a built-in air quality sensor that monitors conditions and adjusts the appliance's output accordingly. For the best productivity, Hamilton beach recommends vacuuming the filter clean two to four times a year. As with all electric appliances, read the safety guidelines prior to use.