Dreame AirPursue PM20 moves more air (CADR) and covers a larger room than Blueair Blue Pure 511.
Which purifier has higher CADR?
Dreame AirPursue PM20 has higher CADR (400 vs 123 CFM).
Which purifier is quieter?
Blueair Blue Pure 511 is quieter (24 vs 60 dB).
Which purifier covers a larger room?
Dreame AirPursue PM20 fits a larger room (about 620 vs 191 sq ft recommended from CADR).
Which purifier has better smart features?
Neither lists Wi-Fi or app control in our sources.
Which purifier has longer filter life?
Blueair Blue Pure 511 lists a replacement interval of 6 months; Dreame AirPursue PM20 does not.
Bottom line
Dreame AirPursue PM20 moves more air (CADR) and covers a larger room than Blueair Blue Pure 511.
| Metric | Dreame AirPursue PM20 | Blueair Blue Pure 511 |
|---|---|---|
| CADR (smoke) | 400 CFM | 123 CFM |
| Recommended room size | 620 sq ft | 191 sq ft |
| Claimed coverage | 7534 sq ft | 189 sq ft |
| Noise | 60 dB | 24 dB |
| Filter type | HEPA-13, carbon, NANO filter, charcoal filter, photocatalyst UV lamp | HEPASilent |
| Filter interval | — | 6 months |
| Smart features | None | None |