Dreame AirPursue PM20 moves more air (CADR) and covers a larger room than Alen 45i.
Which purifier has higher CADR?
Dreame AirPursue PM20 has higher CADR (400 vs 255 CFM).
Which purifier is quieter?
Alen 45i is quieter (23 vs 60 dB).
Which purifier covers a larger room?
Dreame AirPursue PM20 fits a larger room (about 620 vs 395 sq ft recommended from CADR).
Which purifier has better smart features?
Alen 45i lists Wi-Fi or app control; Dreame AirPursue PM20 does not.
Which purifier has longer filter life?
Filter replacement interval is not published for either model.
Bottom line
Dreame AirPursue PM20 moves more air (CADR) and covers a larger room than Alen 45i.
| Metric | Dreame AirPursue PM20 | Alen 45i |
|---|---|---|
| CADR (smoke) | 400 CFM | 255 CFM |
| Recommended room size | 620 sq ft | 395 sq ft |
| Claimed coverage | 7534 sq ft | 1900 sq ft |
| Noise | 60 dB | 23 dB |
| Filter type | HEPA-13, carbon, NANO filter, charcoal filter, photocatalyst UV lamp | HEPA |
| Filter interval | — | — |
| Smart features | None | None |