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 321 CFM for the Blueair Blue Signature SP3i, a difference of 36%.
Which purifier is quieter?
Blueair Blue Pure 211i Max is quieter (23 vs 54 dB).
Which purifier covers a larger room?
Blueair Blue Pure 211i Max fits a larger room (about 674 vs 498 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 WiFi Smart Control, Auto Mode, Odor & Smoke Removal, AHAM Verified).
Which purifier has better filtration?
Both list HEPASilent filtration.
Bottom line
Choose Blueair Blue Pure 211i Max for higher CADR and larger-room coverage and lower noise.
| Metric | Blueair Blue Pure 211i Max | Blueair Blue Signature SP3i | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 435 CFM | 321 CFM | Blueair Blue Pure 211i Max (+36%) |
| Recommended room size | 674 sq ft | 498 sq ft | Blueair Blue Pure 211i Max (+35%) |
| Manufacturer claimed coverage | 3235 sq ft | 2250 sq ft | — |
| Minimum noise | 23 dB | 54 dB | Blueair Blue Pure 211i Max |
| Filter type | HEPASilent | HEPASilent | — |
| Power | 46 W | 36 W | — |
| Wi-Fi / app | Yes | Yes | — |
| Dimensions | 22.7 × 14.4 × 14.4 in | — | — |
| Weight | 16.2 lb | 9.5 lb | — |