Blueair Blue Pure 211i Max moves more air (CADR) and covers a larger room than Blueair Blue Pure 511.
Which purifier has higher CADR?
Blueair Blue Pure 211i Max has higher CADR (435 vs 123 CFM).
Which purifier is quieter?
Blueair Blue Pure 211i Max is quieter (23 vs 24 dB).
Which purifier covers a larger room?
Blueair Blue Pure 211i Max fits a larger room (about 674 vs 191 sq ft recommended from CADR).
Which purifier has better smart features?
Blueair Blue Pure 211i Max lists Wi-Fi or app control; Blueair Blue Pure 511 does not.
Which purifier has longer filter life?
Blueair Blue Pure 511 lists a replacement interval of 6 months; Blueair Blue Pure 211i Max does not.
Bottom line
Blueair Blue Pure 211i Max moves more air (CADR) and covers a larger room than Blueair Blue Pure 511.
| Metric | Blueair Blue Pure 211i Max | Blueair Blue Pure 511 |
|---|---|---|
| CADR (smoke) | 435 CFM | 123 CFM |
| Recommended room size | 674 sq ft | 191 sq ft |
| Claimed coverage | 3235 sq ft | 189 sq ft |
| Noise | 23 dB | 24 dB |
| Filter type | HEPASilent | HEPASilent |
| Filter interval | — | 6 months |
| Smart features | None | None |