Blueair Blue Pure 511i Max vs Levoit Vital 100S
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: A 4.2 lb nightstand-size purifier
Check price at AmazonBest for: A 143 CFM purifier with HEPA-grade sleep mode
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 Pure 511i Max | Levoit Vital 100S | 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 | 23 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. | 153 CFM | 143 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. | 48 dB | 52 dB | 15% |
| CADR per wattComputed by us: smoke CADR divided by rated power. A bedroom unit often runs all night, every night. | 9 CFM/W | 4.1 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. | 9 months | Not listed | 10% |
| CADR (smoke / dust / pollen) | 153 / 159 / 174 | Not listed | info |
| Recommended room | 237 ft² (4.8 ACH) | Not listed | info |
| Filter | Particle + carbon | Washable pre-filter + HEPA + activated carbon | info |
| Filter life | Up to 9 months (RealTrack) | Not listed | info |
| Noise | 19–48 dB | 23–52 dB | info |
| Power | 17 W | Not listed | info |
| Weight | 4.2 lb | 8.6 lb | info |
| CADR | Not listed | 143 CFM | info |
| Ideal room size | Not listed | 222 ft² (4.8 ACH) / 1,066 ft² (1 ACH) | info |
| Rated power | Not listed | 35 W | info |
| AirPick score | 6.8/10 | 5.1/10 | 100% |
Where each one comes out ahead
Blueair Blue Pure 511i Max
Better published figure on: Quietest setting, Smoke CADR, Loudest setting, CADR per watt.
What we like
- 9 CFM per watt
- 4.2 lb
Watch out for
- 9-month filter
Levoit Vital 100S
No scored spec where it is strictly ahead; its case rests on the strengths below.
What we like
- Activated carbon
- App control
Watch out for
- 52 dB on high
Verdict
Similar CADR (153 vs 143). The 511i Max is quieter (19–48 vs 23–52 dB), uses half the power (17 vs 35 W) and weighs 4.2 vs 8.6 lb.
- Blueair Blue Pure 511i Max: Blueair: Blue Pure 511i Max
- Levoit Vital 100S: Levoit: Vital 100S-P