BLUEAIR Blue Pure 311i Max moves more air (CADR) and covers a larger room than KNKA APH4000.
Which purifier has higher CADR?
BLUEAIR Blue Pure 311i Max has higher CADR (365 vs 226 CFM).
Which purifier is quieter?
KNKA APH4000 is quieter (22 vs 23 dB).
Which purifier covers a larger room?
BLUEAIR Blue Pure 311i Max fits a larger room (about 566 vs 350 sq ft recommended from CADR).
Which purifier has better smart features?
BLUEAIR Blue Pure 311i Max lists Wi-Fi or app control; KNKA APH4000 does not.
Which purifier has longer filter life?
BLUEAIR Blue Pure 311i Max lists a replacement interval of 9 months; KNKA APH4000 does not.
Bottom line
BLUEAIR Blue Pure 311i Max moves more air (CADR) and covers a larger room than KNKA APH4000.
| Metric | BLUEAIR Blue Pure 311i Max | KNKA APH4000 |
|---|---|---|
| CADR (smoke) | 365 CFM | 226 CFM |
| Recommended room size | 566 sq ft | 350 sq ft |
| Claimed coverage | 2107 sq ft | 1695 sq ft |
| Noise | 23 dB | 22 dB |
| Filter type | HEPASilent | HEPA |
| Filter interval | 9 months | — |
| Smart features | None | None |