Coway
Coway Airmega 400
Air purifiers
$549List price
Explore this product Your shortlist, side by side
Coway Airmega 400 vs Blueair Blue Pure 311i Max
Find the differences that matter for your next decision.
Blueair
Blueair Blue Pure 311i Max
Air purifiers
$229List price
Explore this product What matters most to you?
Start with all rankable specifications, or focus on a particular use.
Your starting point
Buy the Coway Airmega 400.
- Leads 4 of 5 rankable overall specs; Blueair Blue Pure 311i Max takes 1.
- CADR: 350 CFM vs 250 CFM
How we reached this
We compare the published specifications relevant to your priority. Each rankable specification counts once; your selected requirements can rule a product out. This is a guide to the numbers, not a laboratory performance score.
Coverage area: 1,560 sq ft vs 387 sq ft
Blueair Blue Pure 311i Max is $320 cheaper. Pay the difference only if cadr matters to you.
The trade-off to know
Check first: the Coway Airmega 400 has no Wi-Fi app. Tick them under deal-breakers if that rules it out.
Look at the differences ↓Refine your requirements
What would rule one out?
Side by side
The differences, in detail.
Start with the key specs, then explore as much as you need.
| What you’re comparing | Coway Airmega 400 | Blueair Blue Pure 311i Max |
|---|---|---|
| CADRPerformance | 350 CFM (Smoke), 328 CFM (Dust), 400 CFM (Pollen) | 250 CFM (Smoke), 250 CFM (Dust), 250 CFM (Pollen) |
| Room sizePerformance | Large living rooms, open floor plans, offices | Medium to large bedrooms, living rooms, and open offices up to 387 sq ft (4.8 ACH) / 929 sq ft (2 ACH) |
| Coverage areaPerformance | 1,560 sq ft (2 air changes/hr) / 780 sq ft (4 air changes/hr) | 387 sq ft (4.8 air changes/hr) / 929 sq ft (2 air changes/hr) |
| Filter typesFilters | Washable Pre-filter + Max2 Filter (True HEPA + Activated Carbon) | HEPASilent Main Particle + Carbon filter with customizable machine-washable fabric pre-filter |
| Filter lifeFilters | 12 months (Max2 filter) / Washable pre-filters | 6 to 9 months (tracked by RealTrack algorithm in app) |
Showing 5 of 11 specifications. Missing values stay unlisted. About the sources
Both sides of the decision
What you gain. What you give up.
Coway Airmega 400
Reasons to choose it
- Massive CADR cleans up to 1,560 sq ft twice per hour
- Dual-sided air intake with combined True HEPA and carbon filters
- Smart Eco mode turns off fan when air remains clean for 30 minutes
Worth considering
- Cube design has a large floor footprint
- No mobile app connectivity on the non-S model
Blueair Blue Pure 311i Max
Reasons to choose it
- HEPASilent dual filtration combines electrostatic and mechanical filtration for faster airflow at lower noise
- Cleans up to 387 sq ft in 12.5 minutes (4.8 ACH) / up to 929 sq ft in 30 minutes (2 ACH)
- Ultra-quiet 23dB Night Mode with Energy Star certified low electricity draw
Worth considering
- Fabric pre-filter covers the exterior and requires periodic vacuuming/washing
- Filter replacements needed every 6 to 9 months
Beyond the spec sheet
Living with your choice.
Explore the ownership details available for this pair.
What three years could cost
Coway Airmega 400
3-Year Estimated Total$819
Blueair Blue Pure 311i Max
3-Year Estimated Total$334
Room Placement & Bedroom Noise Check
Physical clearance required for airflow, wall placement, and bedroom noise levels.
Wall Clearance Required
Coway
Requires 12 in perimeter airflow space
Blueair
360° fabric pre-filter intake (needs 12 in wall space)
Nighttime Sleep Mode Noise
Coway
Standard sleep speed
Blueair
23 dB lowest speed setting
Unit Footprint & Dimensions
Coway
Standard room purifier footprint
Blueair
Cylindrical aesthetic (12.4 × 12.4 × 18.9 in; 7.8 lb)
Everyday ownership notes
Documented ergonomic quirks, hardware annoyances, and maintenance realities reported by real owners.
Coway: What to watch for
- Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
Blueair: What to watch for
- Maintenance
Outer fabric pre-filter attracts visible pet fur and lint.
Know what’s behind the comparison
Published specs. Visible sources.
Clinchmark compares manufacturer specifications and other published information. We have not independently lab-tested these products. Editorial assessments and unknown values are identified in the specification details.
Catalog snapshot: September 1, 2026. Prices, availability, and provider terms can change.
Still weighing it up?
Which is cheaper, the Coway Airmega 400 or the Blueair Blue Pure 311i Max?
Blueair Blue Pure 311i Max costs $320 less at list price.
What is the biggest catch with the Coway Airmega 400 or Blueair Blue Pure 311i Max?
Coway Airmega 400 has this deal-breaker: no Wi-Fi app. No schedules or remote control from your phone.
Which is better for bedrooms, the Coway Airmega 400 or the Blueair Blue Pure 311i Max?
Tied on bedrooms. Blueair Blue Pure 311i Max is cheaper. The 2 rankable bedrooms specs split 1 to 1. Saves $320 at list price.
What cannot be compared from spec sheets?
Of the 11 specs tracked here, 6 are descriptive and cannot be ranked on numbers alone. Spec sheets also cannot measure subjective factors like build quality, real-world performance, or comfort.