Choose Frigidaire PureA300 if you want lower noise.
Which purifier has higher CADR?
Alen 45i has published CADR; Frigidaire PureA300 does not.
Which purifier is quieter?
Frigidaire PureA300 is quieter (20 vs 23 dB).
Which purifier covers a larger room?
Alen 45i is recommended for about 395 sq ft based on 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 Connected, Energy Star Certified, Ultra-quiet 20 dBA).
Which purifier has better filtration?
Both list HEPA filtration.
Bottom line
Choose Frigidaire PureA300 if you want lower noise.
| Metric | Alen 45i | Frigidaire PureA300 | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 255 CFM | — | — |
| Recommended room size | 395 sq ft | — | — |
| Manufacturer claimed coverage | 1900 sq ft | 850 sq ft | — |
| Minimum noise | 23 dB | 20 dB | Frigidaire PureA300 |
| Filter type | HEPA | HEPA | — |
| Wi-Fi / app | Yes | Yes | — |
| Weight | 14 lb | 7.5 lb | — |