Choose Blueair Blue Pure 211i 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 211i Max has a smoke CADR of 435 CFM versus 141 CFM for the Blueair Blue Pure 411i Max, a difference of 209%.
Which purifier is quieter?
Blueair Blue Pure 411i Max is quieter (18 vs 23 dB).
Which purifier covers a larger room?
Blueair Blue Pure 211i Max fits a larger room (about 674 vs 219 sq ft recommended from CADR).
Which purifier has better smart features?
Both list smart features (Captures 99.97% of particles as small as 0.1 microns, RealTrack technology for filter lifetime tracking, WiFi connectivity with smart features vs WiFi connectivity, Auto mode, Air quality sensor).
Which purifier has better filtration?
Both list HEPASilent filtration.
Bottom line
Choose Blueair Blue Pure 211i Max for higher CADR and larger-room coverage. Choose Blueair Blue Pure 411i Max if you want lower noise.
| Metric | Blueair Blue Pure 211i Max | Blueair Blue Pure 411i Max | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 435 CFM | 141 CFM | Blueair Blue Pure 211i Max (+209%) |
| Recommended room size | 674 sq ft | 219 sq ft | Blueair Blue Pure 211i Max (+208%) |
| Manufacturer claimed coverage | 3235 sq ft | 1080 sq ft | — |
| Minimum noise | 23 dB | 18 dB | Blueair Blue Pure 411i Max |
| Filter type | HEPASilent | HEPASilent | — |
| Replacement interval | — | 6-8 months | — |
| Power | 46 W | 20 W | — |
| Wi-Fi / app | Yes | Yes | — |
| Dimensions | 22.7 × 14.4 × 14.4 in | — | — |
| Weight | 16.2 lb | 7.5 lb | — |