Choose Blueair Blue Signature Small 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 Small has a smoke CADR of 160 CFM versus 141 CFM for the Blueair Blue Pure 411i Max, a difference of 13%.
Which purifier is quieter?
Blueair Blue Pure 411i Max is quieter (18 vs 50 dB).
Which purifier covers a larger room?
Blueair Blue Signature Small fits a larger room (about 248 vs 219 sq ft recommended from CADR).
Which purifier has better smart features?
Both list smart features (7 stages of superior filtration, Smart VOC sensing, HEPASilent filtration technology captures 99.97% of tiny airborne pollutants vs WiFi connectivity, Auto mode, Air quality sensor).
Which purifier has better filtration?
Both list HEPASilent filtration.
Bottom line
Choose Blueair Blue Signature Small for higher CADR and larger-room coverage. Choose Blueair Blue Pure 411i Max if you want lower noise.
| Metric | Blueair Blue Signature Small | Blueair Blue Pure 411i Max | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 160 CFM | 141 CFM | Blueair Blue Signature Small (+13%) |
| Recommended room size | 248 sq ft | 219 sq ft | Blueair Blue Signature Small (+13%) |
| Manufacturer claimed coverage | 248 sq ft | 1080 sq ft | — |
| Minimum noise | 50 dB | 18 dB | Blueair Blue Pure 411i Max |
| Filter type | HEPASilent | HEPASilent | — |
| Replacement interval | — | 6-8 months | — |
| Power | 20 W | 20 W | — |
| Wi-Fi / app | Yes | Yes | — |
| Weight | 5.64 lb | 7.5 lb | — |