Blueair Blue Pure 311I Max vs Coway Airmega 400S
Verdict: Coway Airmega 400S wins on raw coverage and filter longevity per RTINGS and Consumer Reports data. Blueair Blue Pure 311i Max is quieter at max speed in some tests and has a sleeker profile. Both deliver strong HEPA performance but Coway handles bigger spaces better.
Winner: Coway Airmega 400S
Blueair Blue Pure 311I Max: 8/10
Coway Airmega 400S: 8.5/10
Spec-by-spec comparison
| Blueair Blue Pure 311I Max | Coway Airmega 400S | |
|---|---|---|
| room_size_sqft | 1047 | 1560 |
| cadr_cfm | 300 | 325 |
| filter_type | HEPA + Carbon | HEPA + Carbon |
| noise_level_db | 23-56 | 22-52 |
Blueair Blue Pure 311I Max
What works
- 1047 sq ft coverage (per manufacturer)
- 23 dB low noise mode
- Wi-Fi app control with air quality sensor
What doesn't
- Filter replacement every 6 months
- Higher energy use at max speed
Coway Airmega 400S
What works
- 1560 sq ft coverage (per manufacturer)
- 22 dB low noise mode
- Smart app with auto mode and filter life tracking
What doesn't
- Larger footprint than most competitors
- Filter replacement every 12 months but higher cost
Bottom line
Our pick: Coway Airmega 400S.
People also ask
How does Winix 5500-2 vs Coway Airmega 400S compare?
The Winix 5500-2 and Coway Airmega 400S both use HEPA filtration and auto sensors for room air quality. Coway adds app connectivity while Winix emphasizes plasma wave odor reduction.
View full comparison on GoodPickr
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