Trion® electronic air cleaners easily attach directly to your home's heating and cooling system ductwork, passing recirculated air through the air cleaner. A permanent, washable, aluminum mesh pre-filter captures large particles in the air pulled in by the furnace blower. High-voltage ionization within the Trion® exclusive Forever Filter® purifying cell then attracts and captures the particles on alternately charged aluminum plates, filtering up to 95% of particles as minute as 0.1 micron and preventing harmful irritants from being constantly recirculated. Trion® Electronic Whole-House Air Cleaner, Series: HE Plus, 2000 cfm, 24-1/4 in Height, 22-1/2 in Width, 7-1/8 in Depth, 120 V AC, 1 ph, 50/60 Hz Power Source, White, Domestic