Hello, I'm selling my Blue Air 603 with new filter (still in the box). bought 2015-12-07 (6 months). In perfect condition. Original price 6888RMB => propose price 5500RMB Blueair Classic 603 The strong silent type. With the highest Clean Air Delivery Rate (CADR) in the world, the portable 603 air purifier leads the way in speed and efficiency. Designed for rooms approximately 700 square feet, the 603 is perfect for large family rooms, basements, open work spaces in need of cleaner, healthier indoor air.