Blueair
Blueair Blue Pure 311i Max
Air purifiers
$229List price
Explore this product Your shortlist, side by side
Blueair Blue Pure 311i Max vs Coway Airmega 250
Find the differences that matter for your next decision.
Coway
Coway Airmega 250
Air purifiers
$399List 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 250.
- Leads 3 of 5 rankable overall specs; Blueair Blue Pure 311i Max takes 2.
- Coverage area: 930 sq ft vs 387 sq ft
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.
Noise levels: 22 dB vs 23 dB
Blueair Blue Pure 311i Max is $170 cheaper. Pay the difference only if coverage area matters to you.
The trade-off to know
Coway Airmega 250: No Wi-Fi app connectivity on the standard 250 model (app available on 250S variant)
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 | Blueair Blue Pure 311i Max | Coway Airmega 250 |
|---|---|---|
| CADRPerformance | 250 CFM (Smoke), 250 CFM (Dust), 250 CFM (Pollen) | 249 CFM (Smoke), 261 CFM (Dust), 230 CFM (Pollen) |
| Room sizePerformance | Medium to large bedrooms, living rooms, and open offices up to 387 sq ft (4.8 ACH) / 929 sq ft (2 ACH) | Large bedrooms, apartments, living rooms, and open layouts up to 930 sq ft |
| Coverage areaPerformance | 387 sq ft (4.8 air changes/hr) / 929 sq ft (2 air changes/hr) | 930 sq ft (2 air changes/hr) / 465 sq ft (4 air changes/hr) |
| Filter typesFilters | HEPASilent Main Particle + Carbon filter with customizable machine-washable fabric pre-filter | EZ-clean Washable Pre-filter + Max2 Green True HEPA and Activated Carbon filter |
| Filter lifeFilters | 6 to 9 months (tracked by RealTrack algorithm in app) | 12 months (Max2 filter) / Washable slide-out pre-filter |
Showing 5 of 11 specifications. Missing values stay unlisted. About the sources
Both sides of the decision
What you gain. What you give up.
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
Coway Airmega 250
Reasons to choose it
- Green True HEPA filter captures 99.999% of 0.01-micron ultrafine particles and neutralizes odors
- Easy-to-clean EZ-pull front pre-filter slides out from the top without opening the machine
- Covers up to 930 sq ft with Smart Auto Mode and real-time PM2.5 particle sensor LED ring
Worth considering
- No Wi-Fi app connectivity on the standard 250 model (app available on 250S variant)
- Substantial 20.5 lb weight
Beyond the spec sheet
Living with your choice.
Explore the ownership details available for this pair.
What three years could cost
Blueair Blue Pure 311i Max
3-Year Estimated Total$334
Coway Airmega 250
3-Year Estimated Total$564
Room Placement & Bedroom Noise Check
Physical clearance required for airflow, wall placement, and bedroom noise levels.
Wall Clearance Required
Blueair
360° fabric pre-filter intake (needs 12 in wall space)
Coway
Bottom & dual-side intake: sits flush against back wall
Nighttime Sleep Mode Noise
Blueair
23 dB lowest speed setting
Coway
22 dB sleep mode with auto-dimming LED light sensor
Unit Footprint & Dimensions
Blueair
Cylindrical aesthetic (12.4 × 12.4 × 18.9 in; 7.8 lb)
Coway
Modern slim tower (19.7 × 18.5 × 8.3 in; 20.5 lb)
Everyday ownership notes
Documented ergonomic quirks, hardware annoyances, and maintenance realities reported by real owners.
Blueair: What to watch for
- Maintenance
Outer fabric pre-filter attracts visible pet fur and lint.
Coway: What to watch for
- Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
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 Blueair Blue Pure 311i Max or the Coway Airmega 250?
Blueair Blue Pure 311i Max costs $170 less at list price.
What is the biggest catch with the Blueair Blue Pure 311i Max or Coway Airmega 250?
Both has this deal-breaker: under 1,000 sq ft coverage. Undersized for an open-plan living area.
Which is better for bedrooms, the Blueair Blue Pure 311i Max or the Coway Airmega 250?
Tied on bedrooms. Blueair Blue Pure 311i Max is cheaper. The 2 rankable bedrooms specs split 1 to 1. Saves $170 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.