View on LOZ Suggested Retail: $134. Blueair Blue Pure 411+ Auto Large Area Air Purifier with Auto Mode for Sensitivity, Pollen, Dust, Smoke, Pet Dander with HEPASilent Technology and Washable Pre-Filter. One touch auto mode uses a particle sensor to monitor pollutant levels and adjusts fan to ensure optimal air quality; LED indicator displays air quality status as excellent (blue), moderate (orange) or polluted (red). Blueair’s HEPASilent dual filtration delivers more clean air using less noise and energy than HEPA filtration alone; Quickly cleans 190 sq.ft small room in about 12.5 min or up to 912 sq.ft XL space in 60 min, on high.. 7 CALENDAR DAY FULL REFUND GUARANTEE ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 CALENDAR DAY STORAGE IS ALSO AVAILABLE. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.