Choose Dreame AirPursue PM20 for higher CADR and larger-room coverage. Choose Alen 45i if you want lower noise and Wi-Fi or app control.
Which purifier has higher CADR?
The Dreame AirPursue PM20 has a smoke CADR of 400 CFM versus 255 CFM for the Alen 45i, a difference of 57%.
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 better filtration?
Dreame AirPursue PM20 lists HEPA-13, carbon, NANO filter, charcoal filter, photocatalyst UV lamp; Alen 45i lists HEPA.
Bottom line
Choose Dreame AirPursue PM20 for higher CADR and larger-room coverage. Choose Alen 45i if you want lower noise and Wi-Fi or app control.
| Metric | Dreame AirPursue PM20 | Alen 45i | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 400 CFM | 255 CFM | Dreame AirPursue PM20 (+57%) |
| Recommended room size | 620 sq ft | 395 sq ft | Dreame AirPursue PM20 (+57%) |
| Manufacturer claimed coverage | 7534 sq ft | 1900 sq ft | — |
| Minimum noise | 60 dB | 23 dB | Alen 45i |
| Filter type | HEPA-13, carbon, NANO filter, charcoal filter, photocatalyst UV lamp | HEPA | — |
| Wi-Fi / app | No | Yes | — |
| Dimensions | 14.9 × 14.9 × 33.4 in | — | — |
| Weight | — | 14 lb | — |