Dear all, I am leaving Beijing and am selling a Blueair 410B air purifier. Used since summer 2015; in excellent condition. Includes filter, which was replaced within last month and will be good for several more months, at no extra cost. Product details: 33x51x66cm; 25kg. Purifies rooms up to 30-50 sq m. HEPAsilent technology. Captures 99.97 percent of particulates; also removes formaldehyde and other chemicals. Price: 2000rmb. A good deal! New models of the same type go for 5500-7200rmb.