Alen air purifiers compared
ENERGY STAR currently lists 3 Alen models (after merging duplicate listings), from 97 to 370 cfm smoke CADR.
| Model | Smoke CADR (cfm) | ENERGY STAR room size (sq ft) | Energy use (kWh/yr) | Est. electricity/yr* | Most Efficient |
|---|---|---|---|---|---|
| Alen BreatheSmart 25i | 97 | 150 | 90 | $16.48 | Yes |
| Alen BreatheSmart 35i | 150 | 233 | 136 | $24.90 | No |
| Alen BreatheSmart 75i_V2 | 370 | 574 | 304 | $55.66 | No |
*Estimate: ENERGY STAR annual kWh × U.S. average residential rate 18.31¢/kWh (EIA, July 2026 (preliminary)). ENERGY STAR's annual figure assumes 16 hours/day of operation under the DOE test procedure.
Alen on the manufacturer's site (plain link, not an affiliate link)