Choose Alen 45i for higher CADR (255 vs 227 CFM) and larger-room coverage. Choose Frigidaire FHAP2040A1 if you want lower noise.
Which purifier has higher CADR?
The Alen 45i has a smoke CADR of 255 CFM versus 227 CFM for the Frigidaire FHAP2040A1, a difference of 12%.
Which purifier is quieter?
Frigidaire FHAP2040A1 is quieter (20 vs 23 dB).
Which purifier covers a larger room?
Alen 45i fits a larger room (about 395 vs 352 sq ft recommended from CADR).
Which purifier has better smart features?
Both list smart features (True HEPA filtration, Whisper-quiet operation, Smart Sensor, Auto Mode vs 3-stage filtration, Wi‑Fi enabled, Smart Mode, Air Quality Monitoring).
Which purifier has better filtration?
Both list HEPA filtration.
Bottom line
Choose Alen 45i for higher CADR (255 vs 227 CFM) and larger-room coverage. Choose Frigidaire FHAP2040A1 if you want lower noise.
| Metric | Alen 45i | Frigidaire FHAP2040A1 | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 255 CFM | 227 CFM | Alen 45i (+12%) |
| Recommended room size | 395 sq ft | 352 sq ft | Alen 45i (+12%) |
| Manufacturer claimed coverage | 1900 sq ft | 1685 sq ft | — |
| Minimum noise | 23 dB | 20 dB | Frigidaire FHAP2040A1 |
| Filter type | HEPA | HEPA | — |
| Replacement interval | — | 12 months | — |
| Wi-Fi / app | Yes | Yes | — |
| Weight | 14 lb | — | — |