The Trion Air Bear Supreme Media Air Cleaner provides a clean and controlled indoor air environment in your home by removing dirt, dust, pollen and other microscopic particles such as grease and soot from your air. Features The strongest, most reliable power supply and the sturdiest cell in the industry recognized by dealers nationwide Forever Filter never needs replacing, just clean and reuse Connects directly to heating or cooling system Permanent, washable aluminum collection cells deliver longer service life and are easy-to-clean Greater overall HVAC system efficiency because units keep cooling coils clean Electronic airflow sensor is standard on HE Plus 1400/2000 models. Automatically senses air movement within the duct, resulting in reduced power usage. Built-in internal fuse protects the 24V transformer in the event of a power supply failure All units are UL/C-UL listed and are easily converted to 240V Rugged cabinet construction for long life Optional charcoal after-filter greatly reduces common household odors