Choose Blueair Blue Pure 211i Max for higher CADR and larger-room coverage.
Which purifier has higher CADR?
The Blueair Blue Pure 211i Max has a smoke CADR of 435 CFM versus 365 CFM for the Blueair Blue Pure 311i Max, a difference of 19%.
Which purifier is quieter?
Both list a minimum of 23 dB.
Which purifier covers a larger room?
Blueair Blue Pure 211i Max fits a larger room (about 674 vs 566 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 Removes 99.97% of airborne particles down to 0.1 microns, WiFi connectivity and auto-mode, LED air quality indicator, Ultra-quiet performance).
Which purifier has better filtration?
Both list HEPASilent filtration.
Bottom line
Choose Blueair Blue Pure 211i Max for higher CADR and larger-room coverage.
| Metric | Blueair Blue Pure 211i Max | Blueair Blue Pure 311i Max | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 435 CFM | 365 CFM | Blueair Blue Pure 211i Max (+19%) |
| Recommended room size | 674 sq ft | 566 sq ft | Blueair Blue Pure 211i Max (+19%) |
| Manufacturer claimed coverage | 3235 sq ft | 2107 sq ft | — |
| Minimum noise | 23 dB | 23 dB | — |
| Filter type | HEPASilent | HEPASilent | — |
| Replacement interval | — | 9 months | — |
| Power | 46 W | 32 W | — |
| Wi-Fi / app | Yes | Yes | — |
| Dimensions | 22.7 × 14.4 × 14.4 in | 19 × 12.5 × 12.5 in | — |
| Weight | 16.2 lb | 7.8 lb | — |