ENERGY STAR certified models may include one or more of the following technologies:
· Filters remove pollutants from the air by capturing them as the air passes through the filter. Room air purifiers with High Efficiency Particulate Air (HEPA) and ULPA (ultra-HEPA) filters use this method to clean air.
· Electrostatic precipitators use oppositely charged metal plates or wires to attract and capture particle matter.
· Ionizers, which are frequently found in room air purifiers that also contain filters, emit a charge to the air that causes particles to attach to a filter or other surface.