Blueair Blue Pure 211i Max moves more air (CADR) and covers a larger room than BLUEAIR Blue Pure 511i Max.
Which purifier has higher CADR?
Blueair Blue Pure 211i Max has higher CADR (435 vs 174 CFM).
Which purifier is quieter?
BLUEAIR Blue Pure 511i Max is quieter (19 vs 23 dB).
Which purifier covers a larger room?
Blueair Blue Pure 211i Max fits a larger room (about 674 vs 270 sq ft recommended from CADR).
Which purifier has better smart features?
Both list smart features (None vs None).
Which purifier has longer filter life?
BLUEAIR Blue Pure 511i Max lists a replacement interval of 9; 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 511i Max.
| Metric | Blueair Blue Pure 211i Max | BLUEAIR Blue Pure 511i Max |
|---|---|---|
| CADR (smoke) | 435 CFM | 174 CFM |
| Recommended room size | 674 sq ft | 270 sq ft |
| Claimed coverage | 3235 sq ft | 465 sq ft |
| Noise | 23 dB | 19 dB |
| Filter type | HEPASilent | HEPASilent |
| Filter interval | — | 9 |
| Smart features | None | None |