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Head to head

Blueair Protect 7470i vs Coway Airmega 250

Blueair Protect 7470i leads 2 to 1 on the 3 rankable specs, but Coway Airmega 250 costs $250 less. Most of the 11 attributes tracked here are descriptive rather than numeric.

Catalog as of September 1, 2026

Why, in numbers

  • CADR: Blueair Protect 7470i lists 270 CFM (Smoke), 275 CFM (Dust), 280 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 Protect 7470i lists 1,035 sq ft (2 air changes/hr) / 418 sq ft (5 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 Protect 7470i lists Master bedrooms, living areas up to 418 sq ft (5 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 Protect 7470i lists SmartFilter with Smart RFID chip (HEPASilent Ultra + Activated Carbon) (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 Protect 7470i lists 6–12 months with real-time algorithm filter tracking (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 Protect 7470i
$6492 spec wins
Swap

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Coway Airmega 250
$3991 spec win
Swap

Compare a different air purifier

Levoit Core 300S Smart True HEPA Air Purifier$149Winix 5500-2 Air Purifier$159Levoit Core 400S$219Coway Airmega AP-1512HH Mighty$229Blueair Blue Pure 311i Max$229Honeywell HPA300 HEPA Air Purifier$249Levoit Core 600S Smart True HEPA$299Blueair Blue Pure 211+ Auto$339Coway Airmega 400$549Alen BreatheSmart 75i Large Room Air Purifier$749Dyson Purifier Hot+Cool Formaldehyde HP09$799

Buying for

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

Straight answer

Overall: 2 to 1

Buy the Blueair Protect 7470i.

  • Leads 2 of 3 rankable overall specs; Coway Airmega 250 takes 1.
  • CADR: 270 CFM vs 249 CFM
  • Coverage area: 1,035 sq ft vs 930 sq ft
  • Coway Airmega 250 is $250 cheaper. Pay the difference only if cadr matters to you.

Check first: the Blueair Protect 7470i weighs over 25 lb (11 kg). Tick them under deal-breakers if that rules it out.

2 Blueair Protect 7470i3 rankable of 11 specsCoway Airmega 250 1

Deal-breakers

tick what would make you walk away

  • row

    Undersized for an open-plan living area.

    Clear:Blueair Protect 7470i · 1,035 sq ftTrips:Coway Airmega 250 · 930 sq ft
  • row

    Hard to move between rooms.

    Trips:Blueair Protect 7470i · 27.6 lbClear:Coway Airmega 250 · 20.5 lb

At a glance

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

2 of 2 differ

CADR

Blueair

270 CFM (Smoke), 275 CFM (Dust), 280 CFM (Pollen)

Coway

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

Coverage area

Blueair

1,035 sq ft (2 air changes/hr) / 418 sq ft (5 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 Protect 7470i

Upfront list price$649
3-Yr SmartFilter RFID dual-layer (Every 12 months (~$80/yr))+$240
3-Year Estimated Total$889

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

Requires 12 in perimeter airflow 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

Standard sleep speed

Coway

22 dB sleep mode with auto-dimming LED light sensor

Unit Footprint & Dimensions

Blueair

Standard room purifier footprint

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

    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.

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 Protect 7470i$6492 wins
Coway Airmega 250$3991 win

Performance

leads 2-0
Performance specifications. Middle column is Blueair Protect 7470i, right column is Coway Airmega 250.
CADR270 CFM (Smoke), 275 CFM (Dust), 280 CFM (Pollen) (wins this row: higher)249 CFM (Smoke), 261 CFM (Dust), 230 CFM (Pollen)
Room sizeMaster bedrooms, living areas up to 418 sq ft (5 ACH)Large bedrooms, apartments, living rooms, and open layouts up to 930 sq ft
Coverage area1,035 sq ft (2 air changes/hr) / 418 sq ft (5 air changes/hr) (wins this row: higher)930 sq ft (2 air changes/hr) / 465 sq ft (4 air changes/hr)

Filters

2 differences
Filters specifications. Middle column is Blueair Protect 7470i, right column is Coway Airmega 250.
Filter typesSmartFilter with Smart RFID chip (HEPASilent Ultra + Activated Carbon)EZ-clean Washable Pre-filter + Max2 Green True HEPA and Activated Carbon filter
Filter life6–12 months with real-time algorithm filter tracking12 months (Max2 filter) / Washable slide-out pre-filter

Usability & Smart

4 differences
Usability & Smart specifications. Middle column is Blueair Protect 7470i, right column is Coway Airmega 250.
Noise levels22 dB (Low) – 45 dB (High)22 dB (Sleep mode) – 54 dB (Max speed)
Energy consumption43 W max power (Energy Star certified)60 W max power consumption (Energy Star Certified)
Smart featuresBlueair App, Alexa, Google Home, GermShield 24/7 background modeSmart Auto Mode, Rapid Mode, Eco Mode, and Sleep Mode
Air quality sensorsLaser particle sensor (PM1, PM2.5, PM10), TVOC, Temp, HumidityReal-time particle sensor with colorful LED air quality indicator

Design & Ownership

leads 1-0
Design & Ownership specifications. Middle column is Blueair Protect 7470i, right column is Coway Airmega 250.
Weight27.6 lb (12.5 kg)20.5 lb (9.3 kg) (wins this row: lower)
Warranty5 years (with product registration)5 years limited warranty on motor / 1 year electronic parts
Most rows are from the official spec sheet. Marked rows are other published figures or our summary, not lab tests we ran.
Blueair Protect 7470i 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 Protect 7470i

HEPASilent Ultra smart air purifier with 24/7 GermShield bacterial protection and SpiralAir 360 vents.

  • HEPASilent Ultra electrostatic + mechanical filtration kills 99% of germs
  • SpiralAir omnidirectional airflow distributes clean air evenly
  • Premium matte build with intuitive LCD air quality touchscreen

What you give up

  • SmartFilter replacements are relatively costly
  • Heavier metallic construction
Full Blueair Protect 7470i 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

Too close to call on bedrooms from the spec sheets. Only weight is rankable here.

  • Noise levels: 22 dB vs 22 dB
  • Smart features: Blueair App, Alexa, Google Home, GermShield… vs Smart Auto Mode, Rapid Mode, Eco Mode, and…

Big rooms & allergies

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

For big rooms & allergies, buy the Blueair Protect 7470i.

  • Leads 2 of 2 rankable big rooms & allergies specs.
  • CADR: 270 CFM vs 249 CFM
  • Coverage area: 1,035 sq ft vs 930 sq ft
  • Coway Airmega 250 is $250 cheaper. Pay the difference only if cadr matters to you.

Low running cost

Cheap to own: filter life, power draw, warranty

Too close to call on low running cost from the spec sheets.

  • Filter life: 6–12 months with real-time algorithm filter… vs 12 months
  • Energy consumption: 43 W max power 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 Protect 7470i spec sheetCoway Airmega 250 spec sheet

Manufacturer pages: Blueair Protect 7470i ↗ · Coway Airmega 250 ↗

Common questions

Which is cheaper, the Blueair Protect 7470i or the Coway Airmega 250?

Coway Airmega 250 costs $250 less at list price.

What is the biggest catch with the Blueair Protect 7470i or Coway Airmega 250?

Coway Airmega 250 has this deal-breaker: under 1,000 sq ft coverage. Undersized for an open-plan living area.

Which is better for bedrooms, the Blueair Protect 7470i or the Coway Airmega 250?

Too close to call on bedrooms from the spec sheets. Only weight is rankable here. Noise levels: 22 dB vs 22 dB Smart features: Blueair App, Alexa, Google Home, GermShield… vs Smart Auto Mode, Rapid Mode, Eco Mode, and…

What cannot be compared from spec sheets?

Of the 11 specs tracked here, 8 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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