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 321 CFM for the Blueair Blue Signature SP3i, a difference of 42%.
Which purifier is quieter?
Blueair Blue Signature is quieter (23 vs 54 dB).
Which purifier covers a larger room?
Blueair Blue Signature fits a larger room (about 705 vs 498 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 Smart Control, Auto Mode, Odor & Smoke Removal, AHAM Verified).
Which purifier has better filtration?
Both list HEPASilent filtration.
Bottom line
Choose Blueair Blue Signature for higher CADR and larger-room coverage and lower noise.
| Metric | Blueair Blue Signature | Blueair Blue Signature SP3i | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 455 CFM | 321 CFM | Blueair Blue Signature (+42%) |
| Recommended room size | 705 sq ft | 498 sq ft | Blueair Blue Signature (+42%) |
| Manufacturer claimed coverage | 3385 sq ft | 2250 sq ft | — |
| Minimum noise | 23 dB | 54 dB | Blueair Blue Signature |
| Filter type | HEPASilent | HEPASilent | — |
| Power | 42 W | 36 W | — |
| Wi-Fi / app | Yes | Yes | — |
| Dimensions | 17.2 × 15.5 × 15.5 in | — | — |
| Weight | 13.2 lb | 9.5 lb | — |