Choose Blueair Blue Pure 511i Max for higher CADR and larger-room coverage and lower noise.
Which purifier has higher CADR?
The Blueair Blue Pure 511i Max has a smoke CADR of 174 CFM versus 160 CFM for the Blueair Blue Signature Small, a difference of 9%.
Which purifier is quieter?
Blueair Blue Pure 511i Max is quieter (19 vs 50 dB).
Which purifier covers a larger room?
Blueair Blue Pure 511i Max fits a larger room (about 270 vs 248 sq ft recommended from CADR).
Which purifier has better smart features?
Both list smart features (Wi-Fi capability, Smart sensor, Auto mode, Night mode vs 7 stages of superior filtration, Smart VOC sensing, HEPASilent filtration technology captures 99.97% of tiny airborne pollutants).
Which purifier has better filtration?
Both list HEPASilent filtration.
Bottom line
Choose Blueair Blue Pure 511i Max for higher CADR and larger-room coverage and lower noise.
| Metric | Blueair Blue Pure 511i Max | Blueair Blue Signature Small | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 174 CFM | 160 CFM | Blueair Blue Pure 511i Max (+9%) |
| Recommended room size | 270 sq ft | 248 sq ft | Blueair Blue Pure 511i Max (+9%) |
| Manufacturer claimed coverage | 465 sq ft | 248 sq ft | — |
| Minimum noise | 19 dB | 50 dB | Blueair Blue Pure 511i Max |
| Filter type | HEPASilent | HEPASilent | — |
| Power | 17 W | 20 W | — |
| Wi-Fi / app | Yes | Yes | — |
| Weight | 4.2 lb | 5.64 lb | — |