Choose Blueair Blue Pure 511i Max for higher CADR and larger-room coverage. Choose Blueair Blue Pure 411i Max if you want lower noise.
Which purifier has higher CADR?
The Blueair Blue Pure 511i Max has a smoke CADR of 174 CFM versus 141 CFM for the Blueair Blue Pure 411i Max, a difference of 23%.
Which purifier is quieter?
Blueair Blue Pure 411i Max is quieter (18 vs 19 dB).
Which purifier covers a larger room?
Blueair Blue Pure 511i Max fits a larger room (about 270 vs 219 sq ft recommended from CADR).
Which purifier has better smart features?
Both list smart features (Wi-Fi capability, Smart sensor, Auto mode, Night mode vs WiFi connectivity, Auto mode, Air quality sensor).
Which purifier has better filtration?
Both list HEPASilent filtration.
Bottom line
Choose Blueair Blue Pure 511i Max for higher CADR and larger-room coverage. Choose Blueair Blue Pure 411i Max if you want lower noise.
| Metric | Blueair Blue Pure 511i Max | Blueair Blue Pure 411i Max | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 174 CFM | 141 CFM | Blueair Blue Pure 511i Max (+23%) |
| Recommended room size | 270 sq ft | 219 sq ft | Blueair Blue Pure 511i Max (+23%) |
| Manufacturer claimed coverage | 465 sq ft | 1080 sq ft | — |
| Minimum noise | 19 dB | 18 dB | Blueair Blue Pure 411i Max |
| Filter type | HEPASilent | HEPASilent | — |
| Replacement interval | — | 6-8 months | — |
| Power | 17 W | 20 W | — |
| Wi-Fi / app | Yes | Yes | — |
| Weight | 4.2 lb | 7.5 lb | — |