High-Efficiency Air Filtration, Whole-House Purification. With a high clean air delivery rate (CADR) of up to 220m³/h, the air purifier refreshes the air 2 times per hour for a 493 sq.ft room and 6 timers per hour for a 183 sq.ft room. Ten minutes of use changes the air quality significantly, ideal for enclosed rooms like living rooms or bedrooms. 3-Level Fan Speed, 3-Stage Filtration System. Adjust the fan speed(low, medium, high) for different room sizes. A pre-filter traps larger particles, including human hair, fibers, pet fur, and dust particles. A true HEPA filter removes 99.97% of airborne particles sized 0.3 microns, like PM 2.5, dust, smoke particles, pollen, and other pollutants. A carbon filter absorbs/eliminates fumes and volatile organic compounds in the air.