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Head to head

Blueair Blue Pure 311i Max vs Coway Airmega 250

Coway Airmega 250 leads 3 to 2 on the 5 rankable specs, but Blueair Blue Pure 311i Max costs $170 less.

Catalog as of September 1, 2026

Why, in numbers

  • CADR: Blueair Blue Pure 311i Max lists 250 CFM (Smoke), 250 CFM (Dust), 250 CFM (Pollen) (Blueair sheet, 2026-09-02); Coway Airmega 250 lists 249 CFM (Smoke), 261 CFM (Dust), 230 CFM (Pollen) (Coway sheet, 2026-09-02).
  • Coverage area: Blueair Blue Pure 311i Max lists 387 sq ft (4.8 air changes/hr) / 929 sq ft (2 air changes/hr) (Blueair sheet, 2026-09-02); Coway Airmega 250 lists 930 sq ft (2 air changes/hr) / 465 sq ft (4 air changes/hr) (Coway sheet, 2026-09-02).
  • Room size: Blueair Blue Pure 311i Max lists Medium to large bedrooms, living rooms, and open offices up to 387 sq ft (4.8 ACH) / 929 sq ft (2 ACH) (Blueair sheet, 2026-09-02); Coway Airmega 250 lists Large bedrooms, apartments, living rooms, and open layouts up to 930 sq ft (Coway sheet, 2026-09-02).
  • Filter types: Blueair Blue Pure 311i Max lists HEPASilent Main Particle + Carbon filter with customizable machine-washable fabric pre-filter (Blueair sheet, 2026-09-02); Coway Airmega 250 lists EZ-clean Washable Pre-filter + Max2 Green True HEPA and Activated Carbon filter (Coway sheet, 2026-09-02).
  • Filter life: Blueair Blue Pure 311i Max lists 6 to 9 months (tracked by RealTrack algorithm in app) (Blueair sheet, 2026-09-02); Coway Airmega 250 lists 12 months (Max2 filter) / Washable slide-out pre-filter (Coway sheet, 2026-09-02).

Manufacturer list price, not a live offer. Confirm current pricing before you buy.

Blueair Blue Pure 311i Max
$2292 spec wins
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Coway Airmega 250
$3993 spec wins
Swap

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Buying for

Every rankable spec counts once. Pick a lens to score only what matters for your air purifier.

Straight answer

Overall: 2 to 3

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
  • 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.
2 Blueair Blue Pure 311i Max5 rankable of 11 specsCoway Airmega 250 3

Deal-breakers

tick what would make you walk away

  • row

    Undersized for an open-plan living area.

    Trips:Blueair Blue Pure 311i Max · 387 sq ftTrips:Coway Airmega 250 · 930 sq ft

At a glance

The handful of numbers that decide most purchases in this category.

2 of 2 differ

CADR

Blueair

250 CFM (Smoke), 250 CFM (Dust), 250 CFM (Pollen)

Coway

249 CFM (Smoke), 261 CFM (Dust), 230 CFM (Pollen)

Coverage area

Blueair

387 sq ft (4.8 air changes/hr) / 929 sq ft (2 air changes/hr)

Coway

930 sq ft (2 air changes/hr) / 465 sq ft (4 air changes/hr)

True 3-Year Cost of Ownership (TCO)

Upfront price + 3 years of consumables, fees & essential add-ons

Blueair Blue Pure 311i Max

Upfront list price$229
3-Yr SmokeBlock combo filter (Every 6–9 months (~$35/yr))+$105
3-Year Estimated Total$334

Coway Airmega 250

Upfront list price$399
3-Yr Max2 Green True HEPA filter (Every 12 months (~$55/yr))+$165
3-Year Estimated Total$564

Room Placement & Bedroom Noise Check

Physical clearance required for airflow, wall placement, and bedroom noise levels.

Ergonomic & Spatial Check

Wall Clearance Required

Cylindrical 360° filters cannot sit flush against walls without choking intake.

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

Levels below 25 dB are virtually silent for light sleepers.

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)

The 90-Day Owner Regret Check

Documented ergonomic quirks, hardware annoyances, and maintenance realities reported by real owners.

Post-Purchase Truths

Blueair: What to watch for

  • Maintenance

    Outer fabric pre-filter attracts visible pet fur and lint.

    The decorative fabric outer sleeve functions as the coarse pre-filter, requiring weekly vacuuming to avoid looking dusty in living rooms.

Coway: What to watch for

  • Maintenance

    Requires periodic filter replacements to maintain airflow and odor capture.

    Activated carbon and HEPA media gradually saturate, needing replacement once or twice yearly depending on air pollution and pet shedding.

Blueair Blue Pure 311i Max$2292 wins
Coway Airmega 250$3993 wins

Performance

3 differences
Performance specifications. Middle column is Blueair Blue Pure 311i Max, right column is Coway Airmega 250.
CADR250 CFM (Smoke), 250 CFM (Dust), 250 CFM (Pollen) (wins this row: higher)249 CFM (Smoke), 261 CFM (Dust), 230 CFM (Pollen)
Room sizeMedium 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 area387 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) (wins this row: higher)

Filters

2 differences
Filters specifications. Middle column is Blueair Blue Pure 311i Max, right column is Coway Airmega 250.
Filter typesHEPASilent Main Particle + Carbon filter with customizable machine-washable fabric pre-filterEZ-clean Washable Pre-filter + Max2 Green True HEPA and Activated Carbon filter
Filter life6 to 9 months (tracked by RealTrack algorithm in app)12 months (Max2 filter) / Washable slide-out pre-filter

Usability & Smart

leads 1-0
Usability & Smart specifications. Middle column is Blueair Blue Pure 311i Max, right column is Coway Airmega 250.
Noise levels23 dB (Night mode) – 50 dB (Max boost)22 dB (Sleep mode) – 54 dB (Max speed) (wins this row: lower)
Energy consumption38 W max power consumption (Energy Star Most Efficient)60 W max power consumption (Energy Star Certified)
Smart featuresBlueair App (iOS/Android), voice control with Amazon Alexa and Google Assistant, geofencing Welcome Home featureSmart Auto Mode, Rapid Mode, Eco Mode, and Sleep Mode
Air quality sensorsLaser particle sensor with 5-color LED air quality indicator ring (PM1, PM2.5, PM10)Real-time particle sensor with colorful LED air quality indicator

Design & Ownership

2 differences
Design & Ownership specifications. Middle column is Blueair Blue Pure 311i Max, right column is Coway Airmega 250.
Weight7.8 lb (3.5 kg) (wins this row: lower)20.5 lb (9.3 kg)
Warranty2 years limited warranty (extendable to 3 years with product registration)5 years limited warranty on motor / 1 year electronic parts (wins this row: higher)
Most rows are from the official spec sheet. Marked rows are other published figures or our summary, not lab tests we ran.
Blueair Blue Pure 311i Max source (opens in a new tab)Coway Airmega 250 source (opens in a new tab)

Which one should you buy

Pick this one if

Blueair Blue Pure 311i Max

Smart air purifier with HEPASilent dual filtration technology, cleaning up to 929 sq ft in 30 minutes, 23dB whisper quiet operation, and Blueair app control.

  • 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

What you give up

  • Fabric pre-filter covers the exterior and requires periodic vacuuming/washing
  • Filter replacements needed every 6 to 9 months
Full Blueair Blue Pure 311i Max specs →

Pick this one if

Coway Airmega 250

Modern slim aesthetic air purifier with Green True HEPA Max2 filtration, covering up to 930 sq ft, Smart Auto mode, and easy-clean washable pre-filter.

  • 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

What you give up

  • No Wi-Fi app connectivity on the standard 250 model (app available on 250S variant)
  • Substantial 20.5 lb weight
Full Coway Airmega 250 specs →

Best for each use

Bedrooms

Quiet nights: low-speed noise, sleep mode, schedules from your phone

Tied on bedrooms. Blueair Blue Pure 311i Max is cheaper.

  • The 2 rankable bedrooms specs split 1 to 1.
  • Saves $170 at list price.

Big rooms & allergies

Open-plan rooms or allergies: CADR, coverage, filter grade

Tied on big rooms & allergies. Blueair Blue Pure 311i Max is cheaper.

  • The 2 rankable big rooms & allergies specs split 1 to 1.
  • Saves $170 at list price.

Low running cost

Cheap to own: filter life, power draw, warranty

Too close to call on low running cost from the spec sheets. Only warranty is rankable here.

  • Filter life: 6 to 9 months vs 12 months
  • Energy consumption: 38 W max power consumption vs 60 W max power consumption

Every answer above is scored from published figures. A lens uses only the rows that matter for that use, including marked rows that are not on the official sheet. Switch lenses interactively in the panel above.

Done deciding?

Open the full standalone spec sheet for either device.

Blueair Blue Pure 311i Max spec sheetCoway Airmega 250 spec sheet

Manufacturer pages: Blueair Blue Pure 311i Max ↗ · Coway Airmega 250 ↗

Common questions

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.

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