Choose Blueair Blue Pure 211i Max for higher CADR and larger-room coverage and lower noise.
Which purifier has higher CADR?
The Blueair Blue Pure 211i Max has a smoke CADR of 435 CFM versus 252 CFM for the Winix 5520, a difference of 73%.
Which purifier is quieter?
Blueair Blue Pure 211i Max is quieter (23 vs 40 dB).
Which purifier covers a larger room?
Blueair Blue Pure 211i Max fits a larger room (about 674 vs 391 sq ft recommended from CADR).
Which purifier has better smart features?
Both list smart features (Captures 99.97% of particles as small as 0.1 microns, RealTrack technology for filter lifetime tracking, WiFi connectivity with smart features vs 4‑Stage filtration, Wi‑Fi & Alexa control, True HEPA filter, AOC™ carbon filter).
Which purifier has better filtration?
Blueair Blue Pure 211i Max lists HEPASilent; Winix 5520 lists True HEPA, AOC™ Carbon.
Bottom line
Choose Blueair Blue Pure 211i Max for higher CADR and larger-room coverage and lower noise.
| Metric | Blueair Blue Pure 211i Max | Winix 5520 | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 435 CFM | 252 CFM | Blueair Blue Pure 211i Max (+73%) |
| Recommended room size | 674 sq ft | 391 sq ft | Blueair Blue Pure 211i Max (+72%) |
| Manufacturer claimed coverage | 3235 sq ft | 1882 sq ft | — |
| Minimum noise | 23 dB | 40 dB | Blueair Blue Pure 211i Max |
| Filter type | HEPASilent | True HEPA, AOC™ Carbon | — |
| Power | 46 W | 50 W | — |
| Wi-Fi / app | Yes | Yes | — |
| Dimensions | 22.7 × 14.4 × 14.4 in | 13.59 × 8.27 × 22.17 in | — |
| Weight | 16.2 lb | 13.3 lb | — |