Choose Blueair 2-in-1 Pro Purify + Humidify for higher CADR and larger-room coverage. Choose Blueair Blue Pure 511i Max if you want lower noise and Wi-Fi or app control.
Which purifier has higher CADR?
The Blueair 2-in-1 Pro Purify + Humidify has a smoke CADR of 235 CFM versus 174 CFM for the Blueair Blue Pure 511i Max, a difference of 35%.
Which purifier is quieter?
Blueair Blue Pure 511i Max is quieter (19 vs 20 dB).
Which purifier covers a larger room?
Blueair 2-in-1 Pro Purify + Humidify fits a larger room (about 364 vs 270 sq ft recommended from CADR).
Which purifier has better smart features?
Blueair Blue Pure 511i Max lists Wi-Fi or app control; Blueair 2-in-1 Pro Purify + Humidify does not.
Which purifier has better filtration?
Both list HEPASilent filtration.
Bottom line
Choose Blueair 2-in-1 Pro Purify + Humidify for higher CADR and larger-room coverage. Choose Blueair Blue Pure 511i Max if you want lower noise and Wi-Fi or app control.
| Metric | Blueair 2-in-1 Pro Purify + Humidify | Blueair Blue Pure 511i Max | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 235 CFM | 174 CFM | Blueair 2-in-1 Pro Purify + Humidify (+35%) |
| Recommended room size | 364 sq ft | 270 sq ft | Blueair 2-in-1 Pro Purify + Humidify (+35%) |
| Manufacturer claimed coverage | 391 sq ft | 465 sq ft | — |
| Minimum noise | 20 dB | 19 dB | Blueair Blue Pure 511i Max |
| Filter type | HEPASilent | HEPASilent | — |
| Power | Up to 60 W | 17 W | — |
| Wi-Fi / app | No | Yes | — |
| Dimensions | 24.6 × 12.5 × 12.5 in | — | — |
| Weight | 18.5 lb | 4.2 lb | — |