Blueair Blue Pure 311I Max vs Coway Airmega 400S
Verdict: The Coway Airmega 400S outperforms on coverage and CADR per Consumer Reports testing, making it better for large rooms, while the Blueair Blue Pure 311i Max is quieter at low speeds according to Wirecutter and more energy efficient. Coway wins overall for most users needing whole-home purification.
Winner: Coway Airmega 400S
Blueair Blue Pure 311I Max: 7.5/10
Coway Airmega 400S: 8/10
Spec-by-spec comparison
| Blueair Blue Pure 311I Max | Coway Airmega 400S | |
|---|---|---|
| CADR Dust | 300 cfm | 400 cfm |
| Coverage Area | 465 sq ft | 1560 sq ft |
| Noise Level | 23-50 dB | 22-52 dB |
| WiFi Enabled | Yes | Yes |
Blueair Blue Pure 311I Max
What works
- 23 dB minimum noise on low (per Wirecutter)
- Energy Star certified with 5-10W draw
- Washable pre-filter reduces replacement costs
What doesn't
- Smaller 465 sq ft coverage limits large rooms
- Filter replacement every 6 months at $60-80
Coway Airmega 400S
What works
- 1560 sq ft coverage for open floor plans (per Consumer Reports)
- Dual filtration with ionizer option
- Smart app with real-time AQI and scheduling
What doesn't
- Higher 60-80W power draw on turbo
- Filter replacements cost $100+ annually
Bottom line
Our pick: Coway Airmega 400S.
People also ask
How does Winix 5500-2 vs Coway Airmega 400S compare?
The Winix 5500-2 uses a 4-stage filtration system with PlasmaWave technology while the Coway Airmega 400S features dual filters and smart app control. The Winix model suits smaller rooms better than the larger coverage of the Coway unit.
View full comparison on GoodPickr
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