BLUEAIR Blue Pure 311i Max moves more air (CADR) and covers a larger room than FreAire KN-6391RGB.
Which purifier has higher CADR?
BLUEAIR Blue Pure 311i Max has published CADR; FreAire KN-6391RGB does not.
Which purifier is quieter?
BLUEAIR Blue Pure 311i Max lists a minimum of 23 dB; FreAire KN-6391RGB has no published figure.
Which purifier covers a larger room?
BLUEAIR Blue Pure 311i Max is recommended for about 566 sq ft based on CADR.
Which purifier has better smart features?
BLUEAIR Blue Pure 311i Max lists Wi-Fi or app control; FreAire KN-6391RGB does not.
Which purifier has longer filter life?
BLUEAIR Blue Pure 311i Max lists a replacement interval of 9 months; FreAire KN-6391RGB does not.
Bottom line
BLUEAIR Blue Pure 311i Max moves more air (CADR) and covers a larger room than FreAire KN-6391RGB.
| Metric | BLUEAIR Blue Pure 311i Max | FreAire KN-6391RGB |
|---|---|---|
| CADR (smoke) | 365 CFM | — |
| Recommended room size | 566 sq ft | — |
| Claimed coverage | 2107 sq ft | 1086 sq ft |
| Noise | 23 dB | — |
| Filter type | HEPASilent | — |
| Filter interval | 9 months | — |
| Smart features | None | None |