Choose Blueair Blue Signature for higher CADR and larger-room coverage, lower noise, and Wi-Fi or app control.
Which purifier has higher CADR?
The Blueair Blue Signature has a smoke CADR of 455 CFM versus 350 CFM for the Blueair Blue Pure 211+, a difference of 30%.
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 better filtration?
Both list HEPASilent filtration.
Bottom line
Choose Blueair Blue Signature for higher CADR and larger-room coverage, lower noise, and Wi-Fi or app control.
| Metric | Blueair Blue Signature | Blueair Blue Pure 211+ | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 455 CFM | 350 CFM | Blueair Blue Signature (+30%) |
| Recommended room size | 705 sq ft | 543 sq ft | Blueair Blue Signature (+30%) |
| Manufacturer claimed coverage | 3385 sq ft | — | — |
| Minimum noise | 23 dB | 31 dB | Blueair Blue Signature |
| Filter type | HEPASilent | HEPASilent | — |
| Power | 42 W | — | — |
| Wi-Fi / app | Yes | No | — |
| Dimensions | 17.2 × 15.5 × 15.5 in | — | — |
| Weight | 13.2 lb | — | — |