Blueair Blue Pure 211i Max moves more air (CADR) and covers a larger room than BLUEAIR Blue Signature SP3i.
Which purifier has higher CADR?
Blueair Blue Pure 211i Max has higher CADR (435 vs 321 CFM).
Which purifier is quieter?
Blueair Blue Pure 211i Max is quieter (23 vs 54 dB).
Which purifier covers a larger room?
Blueair Blue Pure 211i Max fits a larger room (about 674 vs 498 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 Signature SP3i lists a replacement interval of 1; 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 Signature SP3i.
| Metric | Blueair Blue Pure 211i Max | BLUEAIR Blue Signature SP3i |
|---|---|---|
| CADR (smoke) | 435 CFM | 321 CFM |
| Recommended room size | 674 sq ft | 498 sq ft |
| Claimed coverage | 3235 sq ft | 2250 sq ft |
| Noise | 23 dB | 54 dB |
| Filter type | HEPASilent | HEPASilent |
| Filter interval | — | 1 |
| Smart features | None | None |