Blueair Blue Signature Small vs Coway Airmega 150
Two of the bedroom & small-room air purifiers in our best bedroom & small-room air purifiers: quietest levoit, coway, blueair & winix comparison, lined up spec by spec. Every figure comes from the manufacturer pages linked below, and the scores use the same published formula as the full ranking.
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Best for: The smallest Signature, 160 CFM
Check price at AmazonBest for: A slim 153 CFM purifier, 6.5 in deep
Check price at AmazonSpec-by-spec comparison
Green marks the better published figure. "Not listed" means the manufacturer doesn't publish it.
| Spec | Blueair Blue Signature Small | Coway Airmega 150 | Weight |
|---|---|---|---|
| Quietest settingThe lowest listed noise level, usually sleep mode. Under about 25 dB is near-silent in a bedroom. Shark and Honeywell don't list noise, so they score at the lowest published value in the category. | 19 dB | 19.98 dB | 30% |
| Smoke CADRSmoke CADR when listed (Levoit lists one headline CADR). About 100 CFM suits a 150 sq ft bedroom, and 160 CFM suits 240 sq ft. | 160 CFM | 153 CFM | 25% |
| Loudest settingTop-speed noise, for when you boost it after cooking or during pollen season. Left out when the maker lists only the minimum. | 50 dB | 48.3 dB | 15% |
| CADR per wattComputed by us: smoke CADR divided by rated power. A bedroom unit often runs all night, every night. | 8 CFM/W | 4.4 CFM/W | 10% |
| Carbon or odor stage includedYes when the included filter has an activated-carbon or deodorization layer, per the maker's page. | Yes | Yes | 10% |
| Main filter lifeThe maker's 'up to' life for the main filter. Usage assumptions vary by brand. | 12 months | 12 months | 10% |
| CADR (smoke / dust / pollen) | 160 / 167 / 179 | 153 / 161 / 220 | info |
| Recommended room | 248 ft² (4.8 ACH) | Not listed | info |
| Filter | Particle + carbon | Pre-filter + deodorization filter + HEPA | info |
| Filter life | Up to 1 year (RealTrack) | Deodorization 6 months, HEPA 1 year | info |
| Noise | 19 dB low, 50 dB high | 19.98–48.3 dB(A) | info |
| Power | 20 W max | 35 W | info |
| Weight | 5.64 lb | Not listed | info |
| Coverage | Not listed | 214 ft² at 4.8 ACH; 1,035 ft² at 1 | info |
| Depth | Not listed | 6.5 in | info |
| AirPick score | 6.7/10 | 6.0/10 | 100% |
Where each one comes out ahead
Blueair Blue Signature Small
Better published figure on: Quietest setting, Smoke CADR, CADR per watt.
What we like
- 19 dB on low
- One-year filter
Watch out for
- 50 dB on high
Coway Airmega 150
Better published figure on: Loudest setting.
What we like
- 20 dB low, 48 dB high
- 6.5 in deep
Watch out for
- Deodorization filter lasts 6 months
Verdict
Close on CADR (153 vs 160). Blueair is 1 dB quieter on low and uses 20 vs 35 W. Coway's deodorization layer is rated for 6 months.
- Blueair Blue Signature Small: Blueair: Blue Signature Small
- Coway Airmega 150: Coway: Airmega 150