Choose Dreame AirPursue PM20 for higher CADR and larger-room coverage. Choose Blueair Blue Signature SP3i if you want lower noise and Wi-Fi or app control.
Which purifier has higher CADR?
The Dreame AirPursue PM20 has a smoke CADR of 400 CFM versus 321 CFM for the Blueair Blue Signature SP3i, a difference of 25%.
Which purifier is quieter?
Blueair Blue Signature SP3i is quieter (54 vs 60 dB).
Which purifier covers a larger room?
Dreame AirPursue PM20 fits a larger room (about 620 vs 498 sq ft recommended from CADR).
Which purifier has better smart features?
Blueair Blue Signature SP3i lists Wi-Fi or app control; Dreame AirPursue PM20 does not.
Which purifier has better filtration?
Dreame AirPursue PM20 lists HEPA-13, carbon, NANO filter, charcoal filter, photocatalyst UV lamp; Blueair Blue Signature SP3i lists HEPASilent.
Bottom line
Choose Dreame AirPursue PM20 for higher CADR and larger-room coverage. Choose Blueair Blue Signature SP3i if you want lower noise and Wi-Fi or app control.
| Metric | Dreame AirPursue PM20 | Blueair Blue Signature SP3i | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 400 CFM | 321 CFM | Dreame AirPursue PM20 (+25%) |
| Recommended room size | 620 sq ft | 498 sq ft | Dreame AirPursue PM20 (+24%) |
| Manufacturer claimed coverage | 7534 sq ft | 2250 sq ft | — |
| Minimum noise | 60 dB | 54 dB | Blueair Blue Signature SP3i |
| Filter type | HEPA-13, carbon, NANO filter, charcoal filter, photocatalyst UV lamp | HEPASilent | — |
| Power | — | 36 W | — |
| Wi-Fi / app | No | Yes | — |
| Dimensions | 14.9 × 14.9 × 33.4 in | — | — |
| Weight | — | 9.5 lb | — |