The Air Oasis 3000 countertop air purifier cleans the air in open rooms up to 3000 square feet. This includes great rooms, homes with open floor plans, large living areas, large office areas etc. This model is also ideal for smaller areas with higher than average contaminant levels. This air purifier quickly and effectively reduces carbon-based contaminants, providing fresh, clean smelling air in only minutes. Cleans up to 3000 square foot area. Uses AHPCO technology developed by NASA. Please Note: This item has been built to U.S. electronics specification.