Coway Airmega 400
Dual-filter design for big open spaces.
Specs
| CADR — smoke | 328 cfm |
|---|---|
| CADR — dust | 328 cfm |
| CADR — pollen | 400 cfm |
| Room size (4.8 air changes/hour) | 513 sq ft |
| Noise | 22–52 dB |
| Max power | 66 W |
| Replacement filter | Airmega 400 Max2 Filter Set: $129, up to 12 months |
| Yearly running cost (est.) | $168 (filters $129 + power $39) |
| App control | No |
| Price | $649 |
Source: Coway. Checked 2026-09-25.
How fast does it clean?
| Room (8 ft ceiling) | Air changes/hr | Verdict |
|---|---|---|
| Small bedroom (150 sq ft) | 16.4 | Great |
| Bedroom (250 sq ft) | 9.8 | Great |
| Living room (400 sq ft) | 6.2 | Great |
| Open plan (600 sq ft) | 4.1 | Good |
What it costs to own
Over three years: $1,154 — the $649 purchase plus about $168 a year in filters and electricity.