Blueair Blue Signature moves more air (CADR) and covers a larger room than Blueair Blue Pure 211+.
Which purifier has higher CADR?
Blueair Blue Signature has higher CADR (455 vs 350 CFM).
Which purifier is quieter?
Blueair Blue Signature is quieter (23 vs 31 dB).
Which purifier covers a larger room?
Blueair Blue Signature fits a larger room (about 705 vs 543 sq ft recommended from CADR).
Which purifier has better smart features?
Blueair Blue Signature lists Wi-Fi or app control; Blueair Blue Pure 211+ does not.
Which purifier has longer filter life?
Blueair Blue Signature lists a replacement interval of 179.99; Blueair Blue Pure 211+ does not.
Bottom line
Blueair Blue Signature moves more air (CADR) and covers a larger room than Blueair Blue Pure 211+.
| Metric | Blueair Blue Signature | Blueair Blue Pure 211+ |
|---|---|---|
| CADR (smoke) | 455 CFM | 350 CFM |
| Recommended room size | 705 sq ft | 543 sq ft |
| Claimed coverage | 3385 sq ft | — |
| Noise | 23 dB | 31 dB |
| Filter type | HEPASilent | HEPASilent |
| Filter interval | 179.99 | — |
| Smart features | None | None |