Alen35i
Air purifier · DOE basic model BreatheSmart
DOE certified smoke CADR, most filings
150cfmDOE test
Dust 164 · PM2.5 157 cfm
Effective room size 233 sq ft (DOE)
DOE data as of 2026-11-03DOE record
Does it fit your room? How DOE sizes rooms
Alen 35i: certified to DOE with smoke CADR 150 cfm (the figure most of its filings list), dust 164, PM2.5 157, effective room size 233 sq ft. DOE data as of 2026-11-03.
Every model number on this record
Filed with DOE under basic model BreatheSmart. A listing with any of these numbers is this unit.
| Model number | Filed by |
|---|---|
| BreatheSmart (DOE basic model) | – |
| 35i | Alen |
| 75i_V2 | Alen |
How much does the Alen 35i cost to run?
About $2.06 a month, or $24.70 a year, on DOE's annual energy figure of 136 kWh. Worked out from the figure most of its filings list.
Electricity at 18.16¢/kWh, the US residential average for August 2026 (EIA Electric Power Monthly, table 5.6.A). Each 1¢/kWh you pay above or below 18.16¢ moves the yearly figure by $1.36.
How does the Alen 35i rank in its DOE class?
In its DOE class (air purifiers, PM2.5 CADR 150+ cfm), 63 models have a matched Amazon listing. 11 of them have a higher CADR/W than its 6.7, which is 34% above their median of 5.
DOE's annual energy figure for it is 136 kWh, against their median of 266 kWh: $23.61 a year less at the US average price.
Air purifiers for 200 sq ft (80 with a listing)Among 140 air purifiers, PM2.5 CADR 150+ cfm
Smoke CADR (cfm)150
Higher than 8 of 140. 1 other shares 150.
143591 cfm
Efficiency (CADR/W)6.7
Higher than 108 of 140. 4 others share 6.7.
313.5
Three to compare with
From models with a matched listing.
Within 20 cfm of its size, highest CADR/W
Blueair 4512311000161 smoke CADRRoom 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 4000156 smoke CADRRoom size 241 sq ft, CADR/W 7.7: about 13% less power for the same clean air.
Nearest bigger unit
DREAME CVF16A186 smoke CADRRoom size 288 sq ft, CADR/W 5.3.
DOE record
Air cleaning
- Smoke CADR
- 150 cfm
- Dust CADR
- 164 cfm
- PM2.5 CADR
- 157 cfm
- Effective room size
- 233 sq ft
- Efficiency (IEF)
- 6.7 cfm/W
- Energy use
- 136 kWh/year
Record
- DOE basic model
- BreatheSmart
- DOE class
- 150 <= PM2.5 Clean Air Delivery Rate
- Brands on the filings
- 1
- In DOE's list since
- 2026-11-02first snapshot we hold
Questions
- What room size is it for?
- DOE lists an effective room size of 233 sq ft, based on its smoke CADR of 150 cfm: CADR and room size.
- How much does the Alen 35i cost to run for a year?
- About $24.70, from the figure most of its filings list: DOE's annual figure of 136 kWh at 18.16¢/kWh, the US residential average for August 2026 (EIA).