Choose either model after comparing CADR, recommended room size, noise, and filtration below.
Which purifier has higher CADR?
CADR is not published for either model.
Which purifier is quieter?
Both list a minimum of 20 dB.
Which purifier covers a larger room?
Recommended room size cannot be derived because CADR is missing.
Which purifier has better smart features?
Neither lists Wi-Fi or app control in our sources.
Which purifier has better filtration?
FreAire HAP605 lists Washable Pre-filter+HEPA; FreAire KN6391RGB lists HEPA.
Bottom line
Choose either model after comparing CADR, recommended room size, noise, and filtration below.
| Metric | FreAire HAP605 | FreAire KN6391RGB | Difference / Winner |
|---|---|---|---|
| Manufacturer claimed coverage | 2600 sq ft | 1086 sq ft | — |
| Minimum noise | 20 dB | 20 dB | — |
| Filter type | Washable Pre-filter+HEPA | HEPA | — |
| Wi-Fi / app | No | No | — |
| Dimensions | 12.06 × 6.1 × 16.06 in | — | — |
| Weight | 6.73 lb | 3.06 lb | — |