Blueair Blue Signature moves more air (CADR) and covers a larger room than Alen 45i.
Which purifier has higher CADR?
Blueair Blue Signature has higher CADR (455 vs 255 CFM).
Which purifier is quieter?
Both list a minimum of 23 dB.
Which purifier covers a larger room?
Blueair Blue Signature fits a larger room (about 705 vs 395 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 a replacement interval of 179.99; Alen 45i does not.
Bottom line
Blueair Blue Signature moves more air (CADR) and covers a larger room than Alen 45i.
| Metric | Blueair Blue Signature | Alen 45i |
|---|---|---|
| CADR (smoke) | 455 CFM | 255 CFM |
| Recommended room size | 705 sq ft | 395 sq ft |
| Claimed coverage | 3385 sq ft | 1900 sq ft |
| Noise | 23 dB | 23 dB |
| Filter type | HEPASilent | HEPA |
| Filter interval | 179.99 | — |
| Smart features | None | None |