Medify MA-40 has proven itself to be one of the best air purifiers ever introduced to the market. It blends style, and technology with power, and quality long-term air cleaning. This unit is the perfect choice for nearly every situation and room. Perfect for large size Student’s dorm Rooms, Residential Rooms, Apartments, and Offices. Cleans Air in a 420 square ft, area every 15 minutes allowing for the unit to clean the air of an 840 square ft. area every 30 minutes.