Medify Air MA-40 moves more air (CADR) and covers a larger room than FreAire KN-6391RGB.
Which purifier has higher CADR?
Medify Air MA-40 has published CADR; FreAire KN-6391RGB does not.
Which purifier is quieter?
Medify Air MA-40 lists a minimum of 46 dB; FreAire KN-6391RGB has no published figure.
Which purifier covers a larger room?
Medify Air MA-40 is recommended for about 589 sq ft based on CADR.
Which purifier has better smart features?
Neither lists Wi-Fi or app control in our sources.
Which purifier has longer filter life?
Medify Air MA-40 lists a replacement interval of 4-5 months; FreAire KN-6391RGB does not.
Bottom line
Medify Air MA-40 moves more air (CADR) and covers a larger room than FreAire KN-6391RGB.
| Metric | FreAire KN-6391RGB | Medify Air MA-40 |
|---|---|---|
| CADR (smoke) | — | 380 CFM |
| Recommended room size | — | 589 sq ft |
| Claimed coverage | 1086 sq ft | 1793 sq ft |
| Noise | — | 46 dB |
| Filter type | — | HEPA H14 |
| Filter interval | — | 4-5 months |
| Smart features | None | None |