Head to head
Blueair Protect 7470i vs Coway Airmega 400
Coway Airmega 400 leads 3 to 0 on the 3 rankable specs and costs $100 less, which makes it the straightforward pick. Most of the 11 attributes tracked here are descriptive rather than numeric.
Catalog as of September 1, 2026
Why, in numbers
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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 250$399Alen BreatheSmart 75i Large Room Air Purifier$749Dyson Purifier Hot+Cool Formaldehyde HP09$799Buying for
Straight answer
Overall: 0 to 3
Buy the Coway Airmega 400.
- Leads 3 of 3 rankable overall specs.
- CADR: 350 CFM vs 270 CFM
- Coverage area: 1,560 sq ft vs 1,035 sq ft
- It is also $100 cheaper.
At a glance
The handful of numbers that decide most purchases in this category.
CADR
Blueair
270 CFM (Smoke), 275 CFM (Dust), 280 CFM (Pollen)
Coway
350 CFM (Smoke), 328 CFM (Dust), 400 CFM (Pollen)
Coverage area
Blueair
1,035 sq ft (2 air changes/hr) / 418 sq ft (5 air changes/hr)
Coway
1,560 sq ft (2 air changes/hr) / 780 sq ft (4 air changes/hr)
True 3-Year Cost of Ownership (TCO)
Blueair Protect 7470i
Coway Airmega 400
The 90-Day Owner Regret Check
Documented ergonomic quirks, hardware annoyances, and maintenance realities reported by real owners.
Blueair: What to watch for
- Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
Coway: What to watch for
- Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
Performance
leads 2-0| CADR | 270 CFM (Smoke), 275 CFM (Dust), 280 CFM (Pollen) | 350 CFM (Smoke), 328 CFM (Dust), 400 CFM (Pollen) (wins this row: higher) |
|---|---|---|
| Room size | Master bedrooms, living areas up to 418 sq ft (5 ACH) | Large living rooms, open floor plans, offices |
| Coverage area | 1,035 sq ft (2 air changes/hr) / 418 sq ft (5 air changes/hr) | 1,560 sq ft (2 air changes/hr) / 780 sq ft (4 air changes/hr) (wins this row: higher) |
Filters
2 differences| Filter types | SmartFilter with Smart RFID chip (HEPASilent Ultra + Activated Carbon) | Washable Pre-filter + Max2 Filter (True HEPA + Activated Carbon) |
|---|---|---|
| Filter life | 6–12 months with real-time algorithm filter tracking | 12 months (Max2 filter) / Washable pre-filters |
Usability & Smart
4 differences| Noise levels | 22 dB (Low) – 45 dB (High) | 22 dB (Sleep mode) – 52 dB (Max speed) |
|---|---|---|
| Energy consumption | 43 W max power (Energy Star certified) | 66 W max power consumption (Energy Star Certified) |
| Smart features | Blueair App, Alexa, Google Home, GermShield 24/7 background mode | Smart Auto Mode + Eco Mode (no Wi-Fi app) |
| Air quality sensors | Laser particle sensor (PM1, PM2.5, PM10), TVOC, Temp, Humidity | Real-time particle sensor with colorful LED ring indicator |
Design & Ownership
leads 1-0| Weight | 27.6 lb (12.5 kg) | 24.7 lb (11.2 kg) (wins this row: lower) |
|---|---|---|
| Warranty | 5 years (with product registration) | 5 years limited motor / 1 year electronic parts |
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
Pick this one if
Coway Airmega 400
Dual-suction large room air purifier with Max2 HEPA and activated carbon filtration covering 1,560 sq ft.
- 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
What you give up
- Cube design has a large floor footprint
- No mobile app connectivity on the non-S model
Best for each use
Bedrooms
Too close to call on bedrooms from the spec sheets. Only weight is rankable here.
Big rooms & allergies
For big rooms & allergies, buy the Coway Airmega 400.
Low running cost
Too close to call on low running cost from the spec sheets.
Done deciding?
Open the full standalone spec sheet for either device.
Manufacturer pages: Blueair Protect 7470i ↗ · Coway Airmega 400 ↗
Common questions
Which is cheaper, the Blueair Protect 7470i or the Coway Airmega 400?
Coway Airmega 400 costs $100 less at list price.
What is the biggest catch with the Blueair Protect 7470i or Coway Airmega 400?
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 Blueair Protect 7470i or the Coway Airmega 400?
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 + Eco Mode
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.