Blueair Blue Pure 511i Max
Very quiet on low and sips power (17W).
Specs
| CADR — smoke | 153 cfm |
|---|---|
| CADR — dust | 159 cfm |
| CADR — pollen | 174 cfm |
| Room size (4.8 air changes/hour) | 239 sq ft |
| Noise | 19–48 dB |
| Max power | 17 W |
| Replacement filter | Blue Pure 511i Max SmokeBlock Filter: $39, up to 9 months |
| Yearly running cost (est.) | $62 (filters $52 + power $10) |
| App control | Yes |
| Price | $140 |
Source: Blueair. Checked 2026-09-25.
How fast does it clean?
| Room (8 ft ceiling) | Air changes/hr | Verdict |
|---|---|---|
| Small bedroom (150 sq ft) | 7.7 | Great |
| Bedroom (250 sq ft) | 4.6 | Good |
| Living room (400 sq ft) | 2.9 | Light duty |
| Open plan (600 sq ft) | 1.9 | Too small |
What it costs to own
Over three years: $326 — the $140 purchase plus about $62 a year in filters and electricity.