Alen: 1 DOE certified model
Alen has one air purifier basic model certified to DOE as of 2026-11-03, rated smoke CADR 150 cfm. How its efficiency compares with its DOE class is below.
Source: DOE Compliance Certification Database (air purifiers), data as of 2026-11-03.
Air purifiers
| # | Photo | Model | Labels | Smoke CADR, cfm | Room size | PM2.5 CADR | CADR/W | Brands |
|---|---|---|---|---|---|---|---|---|
| 1 | Alen35i |
| 150cfm, 233 sq ft | 233 sq ft | 157 | 6.7 | 1 |
How efficient is the Alen 35i?
Alen 35i files CADR/W 6.7. The median among the 140 models in its DOE class (air purifiers, PM2.5 CADR 150+ cfm) is 5.5, so it's above the median: higher than 108 of the 140.
A higher CADR/W means more clean air per watt.
Who makes Alen air purifiers?
DOE's database has no manufacturer field, so the evidence is whose model number each unit is filed under and which other brands file the same unit.
Its one basic model isn't filed by any other brand as of 2026-11-03, and the model number isn't another company's. DOE's records tie it to Alen alone.
How much does an Alen air purifier cost to run?
For Alen 35i, DOE's record lists 136 kWh a year, the annual energy figure from DOE's test. That's about $24.70 a year.
At 18.16¢ per kWh, the US average residential price for August 2026 (EIA Electric Power Monthly, table 5.6.A). Worked out from the certified figures.
How does Alen 35i compare with other brands?
Picked by rule from models with a matched listing, DOE data as of 2026-11-03.
- Within 20 cfm of its size, highest CADR/W: Blueair 4512311000, 161 cfm. Room size 250 sq ft, CADR/W 8.6: about 22% less power for the same clean air.
- Nearest size in its class with a higher CADR/W: BOSCH Air 4000, 156 cfm. Room size 241 sq ft, CADR/W 7.7: about 13% less power for the same clean air.
- Nearest bigger unit: DREAME CVF16A, 186 cfm. Room size 288 sq ft, CADR/W 5.3.
Questions about Alen
- Is Alen a good air purifier brand?
- Its one air purifier basic model, Alen 35i, certifies 150 cfm, and its CADR/W of 6.7 is higher than 108 of the 140 in its DOE class (air purifiers, PM2.5 CADR 150+ cfm). We don't test reliability, noise or build quality, so we can't rank brands on those. How we compare models.
- What room size are Alen air purifiers rated for?
- DOE's effective room size for Alen 35i is 233 sq ft, from a certified smoke CADR 150 cfm. CADR and room size.