Choose Blueair Blue Signature for higher CADR and larger-room coverage. Choose Blueair Blue Pure 411i Max if you want lower noise.
Which purifier has higher CADR?
The Blueair Blue Signature has a smoke CADR of 455 CFM versus 141 CFM for the Blueair Blue Pure 411i Max, a difference of 223%.
Which purifier is quieter?
Blueair Blue Pure 411i Max is quieter (18 vs 23 dB).
Which purifier covers a larger room?
Blueair Blue Signature fits a larger room (about 705 vs 219 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 WiFi connectivity, Auto mode, Air quality sensor).
Which purifier has better filtration?
Both list HEPASilent filtration.
Bottom line
Choose Blueair Blue Signature for higher CADR and larger-room coverage. Choose Blueair Blue Pure 411i Max if you want lower noise.
| Metric | Blueair Blue Signature | Blueair Blue Pure 411i Max | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 455 CFM | 141 CFM | Blueair Blue Signature (+223%) |
| Recommended room size | 705 sq ft | 219 sq ft | Blueair Blue Signature (+222%) |
| Manufacturer claimed coverage | 3385 sq ft | 1080 sq ft | — |
| Minimum noise | 23 dB | 18 dB | Blueair Blue Pure 411i Max |
| Filter type | HEPASilent | HEPASilent | — |
| Replacement interval | — | 6-8 months | — |
| Power | 42 W | 20 W | — |
| Wi-Fi / app | Yes | Yes | — |
| Dimensions | 17.2 × 15.5 × 15.5 in | — | — |
| Weight | 13.2 lb | 7.5 lb | — |