Choose Blueair Blue Signature for higher CADR and larger-room coverage and lower noise.
Which purifier has higher CADR?
The Blueair Blue Signature has a smoke CADR of 455 CFM versus 252 CFM for the Winix 5520, a difference of 81%.
Which purifier is quieter?
Blueair Blue Signature is quieter (23 vs 40 dB).
Which purifier covers a larger room?
Blueair Blue Signature fits a larger room (about 705 vs 391 sq ft recommended from CADR).
Which purifier has better smart features?
Both list smart features (7 stages of filtration, 10x more odor removal, Smart VOC sensor, Dynamic display vs 4‑Stage filtration, Wi‑Fi & Alexa control, True HEPA filter, AOC™ carbon filter).
Which purifier has better filtration?
Blueair Blue Signature lists HEPASilent; Winix 5520 lists True HEPA, AOC™ Carbon.
Bottom line
Choose Blueair Blue Signature for higher CADR and larger-room coverage and lower noise.
| Metric | Blueair Blue Signature | Winix 5520 | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 455 CFM | 252 CFM | Blueair Blue Signature (+81%) |
| Recommended room size | 705 sq ft | 391 sq ft | Blueair Blue Signature (+80%) |
| Manufacturer claimed coverage | 3385 sq ft | 1882 sq ft | — |
| Minimum noise | 23 dB | 40 dB | Blueair Blue Signature |
| Filter type | HEPASilent | True HEPA, AOC™ Carbon | — |
| Power | 42 W | 50 W | — |
| Wi-Fi / app | Yes | Yes | — |
| Dimensions | 17.2 × 15.5 × 15.5 in | 13.59 × 8.27 × 22.17 in | — |
| Weight | 13.2 lb | 13.3 lb | — |