Choose Blueair Blue Pure 211i Max for higher CADR and larger-room coverage.
Which purifier has higher CADR?
The Blueair Blue Pure 211i Max has a smoke CADR of 435 CFM versus 255 CFM for the Alen 45i, a difference of 71%.
Which purifier is quieter?
Both list a minimum of 23 dB.
Which purifier covers a larger room?
Blueair Blue Pure 211i Max fits a larger room (about 674 vs 395 sq ft recommended from CADR).
Which purifier has better smart features?
Both list smart features (Captures 99.97% of particles as small as 0.1 microns, RealTrack technology for filter lifetime tracking, WiFi connectivity with smart features vs True HEPA filtration, Whisper-quiet operation, Smart Sensor, Auto Mode).
Which purifier has better filtration?
Blueair Blue Pure 211i Max lists HEPASilent; Alen 45i lists HEPA.
Bottom line
Choose Blueair Blue Pure 211i Max for higher CADR and larger-room coverage.
| Metric | Blueair Blue Pure 211i Max | Alen 45i | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 435 CFM | 255 CFM | Blueair Blue Pure 211i Max (+71%) |
| Recommended room size | 674 sq ft | 395 sq ft | Blueair Blue Pure 211i Max (+71%) |
| Manufacturer claimed coverage | 3235 sq ft | 1900 sq ft | — |
| Minimum noise | 23 dB | 23 dB | — |
| Filter type | HEPASilent | HEPA | — |
| Power | 46 W | — | — |
| Wi-Fi / app | Yes | Yes | — |
| Dimensions | 22.7 × 14.4 × 14.4 in | — | — |
| Weight | 16.2 lb | 14 lb | — |