Blueair Blue Pure 511i Max
#1 in Medium roomsFull review
A compact, quiet smart purifier for bedrooms, nurseries and home offices.
Amazon $112.99$112.99
3.8/5
A strong all-round pick for a living room or large bedroom, with a real particle sensor and app control at a mid-range price.
- 231 cfmSmoke CADR
- 358 sq ftRoom size
- $49.99/yearFilters
- 24 to 52 dBNoise
- 2 yearsWarranty
Check price at Amazon$189.97
Price checked October 22, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Enough airflow for a large bedroom or living room
- Laser sensor and auto mode adjust the fan for you
- Efficient enough to be ENERGY STAR certified
- One filter a year, about $50
Cons
- Bulkier than the smaller Core models
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its room size. How we rank explains each one.
Specifications
| Model number | Core 400S-P (LAP-C401S-WUSR) |
|---|---|
| Performance | |
| Smoke CADR | 231 cfm |
| Dust CADR | 240 cfm |
| Pollen CADR | 259 cfm |
| PM2.5 CADR | 236 cfm |
| CADR certified by | AHAM Verifide |
| Room size (AHAM) | 358 sq ft |
| Coverage (maker) | 1,718 sq ft |
| Noise | 24 to 52 dB |
| Efficiency | |
| Efficiency (IEF) | 5.8 cfm/W |
| ENERGY STAR | Yes |
| Energy use | 237 kWh/year |
| Power at top speed | 38 W |
| Filters | |
| Filter | HEPA |
| Activated carbon | Yes |
| Replacement | Core 400S-P 3-stage replacement filter |
| Replacement cost | $49.99 every 12 months |
| Yearly filter cost | $49.99/year |
| Ionizer | No |
| CARB certified (ozone) | Yes |
| Controls and build | |
| Air-quality sensor | PM2.5 laser |
| Auto mode | Yes |
| Wi-Fi app | Yes |
| Fan speeds | 4 |
| Dimensions | 20.5 x 10.8 x 10.8 in |
| Weight | 11 lb |
| Warranty | 2 years |
Alternatives in this room size
Coway Airmega Mighty AP-1512HH
#3 in Medium roomsFull review
A long-running favourite for a bedroom or living room that’s still cheap on Amazon. It has an air quality sensor but no app.
Amazon $154.98$154.98
Coway Airmega 150
#4 in Medium roomsFull review
A quiet, good-looking purifier for a small bedroom or nursery. Bigger rooms need more airflow for the money.
Amazon $186.29$186.29
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