Blueair Blue Pure 211i Max
#6 in Large roomsFull review
A large-room purifier with very high certified CADR and low running costs, for open-plan living areas.
Amazon $349$349
The Blueair Blue Pure 211i Max is the better air purifier overall, rated 3.7 to 3.3. The Blueair Blue Pure 211i Max leads on value and efficiency. The Alen BreatheSmart 75i wins on quiet. The Blueair Blue Pure 211i Max costs $350.59 less ($349 vs $699.59).
Alen BreatheSmart 75i
#12 in Large roomsFull review
A premium large-room purifier with long-lasting filters, for buyers willing to pay for quiet and a subscription-backed guarantee.
Amazon $699.59$699.59
Prices were last checked October 22, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Blueair Blue Pure 211i Max for value ($0.80 per cfm of smoke CADR vs $1.89 per cfm of smoke CADR) and efficiency (9 cfm per watt vs 6.9 cfm per watt).
- Choose the Alen BreatheSmart 75i for quiet (51 dB at top speed (maker rating) vs 53 dB at top speed (maker rating)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every large rooms air purifier; a clear win is highlighted. How we rank explains each one.
| Factor weight | Blueair Blue Pure 211i Max | Alen BreatheSmart 75i |
|---|---|---|
| Overall rating | 3.7/5 | 3.3/5 |
| Value 25% | 70 $0.80 per cfm of smoke CADR | 0 $1.89 per cfm of smoke CADR |
| Filter cost 20% | 68 $139.98 a year in filters | 76 $99 a year in filters |
| Quiet 20% | 47 53 dB at top speed (maker rating) | 60 51 dB at top speed (maker rating) |
| Efficiency 15% | 88 9 cfm per watt | 61 6.9 cfm per watt |
| Auto mode 10% | 100 particle sensor and Wi-Fi app | 100 particle sensor and Wi-Fi app |
| Warranty 10% | 0 1-year warranty | 50 warranty not published (neutral score used) |
Specifications
| Blueair Blue Pure 211i Max | Alen BreatheSmart 75i | |
|---|---|---|
| Performance | ||
| Smoke CADR | 435 cfm | 370 cfm |
| Dust CADR | 453 cfm | 351 cfm |
| Pollen CADR | 450 cfm | 431 cfm |
| PM2.5 CADR | 444 cfm | 360 cfm |
| CADR certified by | AHAM Verifide | ENERGY STAR |
| Room size (AHAM) | 674 sq ft | 574 sq ft |
| Coverage (maker) | 3,235 sq ft | 2,800 sq ft |
| Noise | 23 to 53 dB | 25 to 51 dB |
| Efficiency | ||
| Efficiency (IEF) | 9 cfm/W | 6.9 cfm/W |
| ENERGY STAR | Yes | Yes |
| Energy use | 256 kWh/year | 304 kWh/year |
| Power at top speed | - | 55 W |
| Filters | ||
| Filter | HEPASilent particle filter with washable fabric pre-filter | HEPA (Essential/Pure filter as sold in this listing) |
| Activated carbon | - | No |
| Replacement | F2MAX (110039) | Essential (Pure), formerly B7 |
| Replacement cost | $69.99 every 6 months | $99 every 12 months |
| Yearly filter cost | $139.98/year | $99/year |
| Ionizer | - | Yes, can be switched off |
| CARB certified (ozone) | Yes | Yes |
| Controls and build | ||
| Air-quality sensor | particle | particle |
| Auto mode | Yes | Yes |
| Wi-Fi app | Yes | Yes |
| Fan speeds | 5 | 5 |
| Dimensions | 22.7 x 14.4 x 14.4 in | 27 x 18.5 x 11.5 in |
| Weight | 16.2 lb | 27 lb |
| Warranty | 1 years | - |