With 1500 sq. ft. of coverage, the XPOWER X-3700 is the ideal commercial air purifier for a variety of spaces including offices, hospitals, waiting rooms, and other areas where air quality and odors are a concern. This scrubber quickly captures contaminants such as bacteria, allergens, mold and sub-micron sized dust with its powerful motor and advanced 4 stage filtration technology that includes activated carbon and HEPA filters. The 1st filter stage is a washable Nylon Mesh Filter which traps larger particles and prolongs the life of the succeeding filters. A 2nd stage high capacity Pleated Media Filter traps smaller particles and helps prevent cross contamination. The 3rd stage is a two pound Activated Carbon Filter which neutralizes even stubborn odors. The final 2” thick professional HEPA filter captures tiny particulate matter down to 0.3 sized microns as well as smaller and larger particulates at an even greater rate. A convenient indicator light notifies you when the filters need cleaning and/or replacement.