Blueair Blue Pure 211i Max: 3 of 8 decision facts sourced. Missing: CADR dust, CADR pollen, Filter cost, Filter life, Noise.
Coway Airmega 400S: 7 of 8 decision facts sourced.
| Blueair Blue Pure 211i Max | Coway Airmega 400S | |
|---|---|---|
| Price today | Price not yet checked | Price not yet checked |
| CADR smoke | 410 cubic feet per minute bestbuy.com | 328 cowaymega.com |
| CADR dust | Not yet sourced | 328 cowaymega.com |
| CADR pollen | Not yet sourced | 400 cowaymega.com |
| Room size | 635 square feet bestbuy.com | 3,120 ft cowaymega.com |
| Filter life | Not yet sourced | 1 Year cowaymega.com |
| Noise | Not yet sourced | 22~52 dB(A) cowaymega.com |
| Starting MSRP | $349.99 bestbuy.com | $749.00 cowaymega.com |
Not yet sourced — Blueair Blue Pure 211i Max: CADR dust, CADR pollen, Filter cost, Filter life, Noise. Coway Airmega 400S: Filter cost. No manufacturer, official or retailer source we read publishes these yet; we don't estimate them.
Verdict: Coway Airmega 400S outperforms the Blueair Blue Pure 211i Max in coverage, filtration efficiency, and smart features, making it the better choice for larger spaces or users who want app control. However, if you need a compact, budget‑friendly unit for a smaller room, the Blueair is adequate. Choose based on room size and desired connectivity.
Provisional pick: Coway Airmega 400S — not enough sourced decision facts for Blueair Blue Pure 211i Max. We don't rank on specs we can't verify.
| Blueair Blue Pure 211I Max | Coway Airmega 400S | |
|---|---|---|
| CADR smoke | 410 cubic feet per minute | 328 |
| Room size | 635 square feet | 3,120 ft |
| Weight | 16.22 pounds | 24.7 lbs |
| Starting MSRP | $349.99 | $749.00 |
| Air Purifier Type | Console | — |
| Filter Longevity | 9 months | — |
Provisional pick: Coway Airmega 400S — not enough sourced decision facts for Blueair Blue Pure 211i Max.
The Dyson Purifier Cool TP09 costs $650, uses a HEPA filter with 360° coverage and formaldehyde destruction, and includes a bladeless fan for cooling. The Blueair Blue Pure 211i Max costs $300, has a larger 635 sq ft CADR rating, simpler one-button controls, and no fan or app features.
The Winix 5500-2 has a 360 sq ft CADR rating and costs about $150, while the Coway Airmega 400S covers 1,560 sq ft with a 2.1x higher CADR and costs around $600. The Winix is the better value for small rooms; the Coway is superior for large spaces.
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