Blueair Blue Pure 311i+ Max
High output for a mid-priced unit.
Specs
| CADR — smoke | 339 cfm |
|---|---|
| CADR — dust | 370 cfm |
| CADR — pollen | 446 cfm |
| Room size (4.8 air changes/hour) | 530 sq ft |
| Noise | 23–50 dB |
| Max power | 38 W |
| Replacement filter | Blue Pure 311i+ Max Particle + Carbon Filter: $50, up to 9 months |
| Yearly running cost (est.) | $89 (filters $67 + power $23) |
| App control | Yes |
| Price | $255 |
Source: Blueair. Checked 2026-09-25.
How fast does it clean?
| Room (8 ft ceiling) | Air changes/hr | Verdict |
|---|---|---|
| Small bedroom (150 sq ft) | 16.9 | Great |
| Bedroom (250 sq ft) | 10.2 | Great |
| Living room (400 sq ft) | 6.4 | Great |
| Open plan (600 sq ft) | 4.2 | Good |
What it costs to own
Over three years: $523 — the $255 purchase plus about $89 a year in filters and electricity.