Air purifier for a 800 sq ft room
Minimum smoke CADR: 533 cfm with an 8 ft ceiling, 600 cfm at 9 ft, 667 cfm at 10 ft.
Based on AHAM's 2/3 rule (smoke CADR ≥ 2/3 of floor area, scaled up for ceilings above 8 ft). For wildfire smoke or allergies, many people size up; the "headroom" column shows models with at least 50% more CADR than the minimum.
2 qualifying models, cheapest to run first
| Model | Smoke CADR (cfm) | ENERGY STAR room size (sq ft) | Energy use (kWh/yr) | Est. electricity/yr* | Headroom |
|---|---|---|---|---|---|
| Coway Airmega ProX | 577 | 894 | 335 | $61.34 | 8% over minimum |
| Cuckoo CAC-F3010FW | 552 | 856 | 406 | $74.34 | 3% over minimum |
*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.
0 of these have at least 50% headroom. Not sure of your room size? Use the room calculator.
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