You can turn off the display lights in Sleep Mode, and 24-decibel [dB(A)] operation is no louder than rustling leaves
Blueair Blue Pure 211i Max Optimal coverage area: 1,524 square feet | CADR Rating: 435 (smoke), 452 (dust), 450 (pollen) | Minimum noise level: 23 dB | Dimensions: 14.4 x 14.4 x 22.7 inches | Weight: 16.2 pounds | Returns and warranty: Free returns within 60 days (if purchased directly from Blueair), 3-year limited warranty Pros: Designed for large spaces Energy-efficient, quiet operation Display can be turned off while the unit is running Cons: Large and somewhat heavy Pricier than other models we recommend The Blueair Blue Pure 211i Max can clean the air in rooms around 600 square feet in just 12 minutes, rooms of about 1,500 square feet in 30 minutes and rooms of roughly 3,000 square feet in an hour
The Hathaspace Smart True HEPA Air Purifier can produce, at most, two air changes per hour in a 350-square-foot room, whereas the Mighty purifier can deliver 5.7
USB-C rapid charging allows for a full charge in less than an hour
Replace every 3 months in normal use
