Experience powerful air purification with the Blueair Blue Pure 311i+ Max Air Purifier. Certified by the AHAM Verified Program, this air purifier cleans up to 1,116sqft large space in just 30 minutes and 465sqft large room in 12.5 minutes on high mode, making it Energy Star Most Efficient 2023. Feel the difference with the Blueair Blue Pure 311i+ Max!