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 adjust fan as-needed to ensure optimal air quality; LED indicator displays air quality status. Ideal for nursery or home office; Cleans 190 ft2 in about 12.5 min (4.8x an hour, based on AHAM recommended removal rate) or up to 912 ft2 in one hour; on high​ setting. HEPASilent technology delivers more clean air, with less noise and less energy used than traditional HEPA filtration. Quiet Mark approved - quieter (18 dB) than whisper on low; ENERGY STAR rated - uses less energy (2W) than an LED light bulb on low.. 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.