Choose Blueair Blue Pure 311i Max for lower noise and Wi-Fi or app control.
Which purifier has higher CADR?
The Blueair Blue Pure 311i Max has a smoke CADR of 365 CFM versus 350 CFM for the Blueair Blue Pure 211+, a difference of 4%.
Which purifier is quieter?
Blueair Blue Pure 311i Max is quieter (23 vs 31 dB).
Which purifier covers a larger room?
Blueair Blue Pure 311i Max fits a larger room (about 566 vs 543 sq ft recommended from CADR).
Which purifier has better smart features?
Blueair Blue Pure 311i Max lists Wi-Fi or app control; Blueair Blue Pure 211+ does not.
Which purifier has better filtration?
Both list HEPASilent filtration.
Bottom line
Choose Blueair Blue Pure 311i Max for lower noise and Wi-Fi or app control.
| Metric | Blueair Blue Pure 311i Max | Blueair Blue Pure 211+ | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 365 CFM | 350 CFM | Blueair Blue Pure 311i Max (+4%) |
| Recommended room size | 566 sq ft | 543 sq ft | Blueair Blue Pure 311i Max (+4%) |
| Manufacturer claimed coverage | 2107 sq ft | — | — |
| Minimum noise | 23 dB | 31 dB | Blueair Blue Pure 311i Max |
| Filter type | HEPASilent | HEPASilent | — |
| Replacement interval | 9 months | — | — |
| Power | 32 W | — | — |
| Wi-Fi / app | Yes | No | — |
| Dimensions | 19 × 12.5 × 12.5 in | — | — |
| Weight | 7.8 lb | — | — |