Coway Airmega ProX vs Blueair Blue Signature
Two of the highest-CADR purifiers on our list.
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Best for: The most clean air of any purifier here
Check price at AmazonBest for: 455 CFM from a 13.2 lb side-outlet unit
Check price at AmazonSpec-by-spec comparison
Green marks the better published figure. "Not listed" means the manufacturer doesn't publish it.
| Spec | Coway Airmega ProX | Blueair Blue Signature | Weight |
|---|---|---|---|
| Smoke CADRSmoke is the hardest of the three AHAM CADR tests, so we use it when listed. Levoit lists one headline CADR, and we use that. Shark, Honeywell, Molekule and IQAir don't publish an AHAM CADR, so those cells are blank and score at the lowest published value in the category. | 568 CFM | 455 CFM | 40% |
| CADR per wattComputed by us: smoke CADR divided by the maker's rated or maximum power. Higher means more clean air for the electricity, which matters for a machine that runs all day. | 8.7 CFM/W | 10.8 CFM/W | 15% |
| Quietest settingThe lowest listed noise level, usually sleep mode. Makers measure at different distances, so treat differences of 1–2 dB as a tie. | 23 dB | 23 dB | 10% |
| Loudest settingNoise at top speed, which is what you hear when you run it hard for smoke or cooking. Left blank when the maker lists only the minimum. | 46 dB | 55 dB | 10% |
| Carbon or odor stage includedYes when the filter in the box includes an activated-carbon or deodorization stage, per the maker. HEPA alone traps particles but not odors or gases. | Yes | Yes | 10% |
| Main filter lifeThe maker's 'up to' figure for the main HEPA filter. Makers assume different daily run times (noted on each product), so this is a rough guide to running costs. | 12 months | 12 months | 15% |
| CADR (smoke / dust / pollen) | 568 / 580 / 450 | 455 / 434 / 450 | info |
| Coverage | 4,253 ft² at 1 air change/hr; 2,126 ft² at 2 | Not listed | info |
| Filter | Washable pre-filter + Max2 (activated carbon + HEPA) | Particle + carbon | info |
| Filter life | Max2: 1 year | Up to 1 year (RealTrack) | info |
| Noise | 23–46 dB(A) | 23–55 dB | info |
| Power | 65 W | 3.5–42 W | info |
| Sensor | PM1, PM2.5, PM10 | Not listed | info |
| Weight | 51 lb | 13.2 lb | info |
| Recommended room | Not listed | 705 ft² (4.8 ACH) | info |
| AirPick score | 8.3/10 | 7.3/10 | 100% |
Where each one comes out ahead
Coway Airmega ProX
Better published figure on: Smoke CADR, Loudest setting.
What we like
- 568 CFM smoke CADR
- Quietest top speed listed here (46 dB)
- 8.7 CFM per watt
Watch out for
- 51 lb and 36.6 in tall
Blueair Blue Signature
Better published figure on: CADR per watt.
What we like
- 10.8 CFM per watt, the best here
- 455 CFM at 13.2 lb
Watch out for
- 55 dB at top speed
Verdict
ProX delivers more clean air (568 vs 455 CFM smoke) and is quieter at the top (46 vs 55 dB). Blue Signature weighs 13.2 lb against 51 lb and gets 10.8 vs 8.7 CFM per watt.
- Coway Airmega ProX: Coway: Airmega ProX
- Blueair Blue Signature: Blueair: Blue Signature