Blueair Blue Signature moves more air (CADR) and covers a larger room than BLUEAIR Blue Signature SP3i.
Which purifier has higher CADR?
Blueair Blue Signature has higher CADR (455 vs 321 CFM).
Which purifier is quieter?
Blueair Blue Signature is quieter (23 vs 54 dB).
Which purifier covers a larger room?
Blueair Blue Signature fits a larger room (about 705 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 lists 179.99; BLUEAIR Blue Signature SP3i lists 1. Intervals are as published and are not converted to a single unit.
Bottom line
Blueair Blue Signature moves more air (CADR) and covers a larger room than BLUEAIR Blue Signature SP3i.
| Metric | Blueair Blue Signature | BLUEAIR Blue Signature SP3i |
|---|---|---|
| CADR (smoke) | 455 CFM | 321 CFM |
| Recommended room size | 705 sq ft | 498 sq ft |
| Claimed coverage | 3385 sq ft | 2250 sq ft |
| Noise | 23 dB | 54 dB |
| Filter type | HEPASilent | HEPASilent |
| Filter interval | 179.99 | 1 |
| Smart features | None | None |