Air purifier for a 600 sq ft room
Minimum smoke CADR: 400 cfm with an 8 ft ceiling, 450 cfm at 9 ft, 500 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.
9 qualifying models, cheapest to run first
| Model | Smoke CADR (cfm) | ENERGY STAR room size (sq ft) | Energy use (kWh/yr) | Est. electricity/yr* | Headroom |
|---|---|---|---|---|---|
| Blueair 4312111000 | 455 | 705 | 235 | $43.03 | 14% over minimum |
| Coway AP-3018B | 413 | 640 | 235 | $43.03 | 3% over minimum |
| Blueair 3613111100 | 443 | 687 | 259 | $47.42 | 11% over minimum |
| Coway Airmega ProX | 577 | 894 | 335 | $61.34 | 44% over minimum |
| Cuckoo CAC-AH2810FNW | 455 | 705 | 388 | $71.04 | 14% over minimum |
| Coway Airmega 450 | 443 | 687 | 389 | $71.23 | 11% over minimum |
| Coway Airmega 450S | 443 | 687 | 399 | $73.06 | 11% over minimum |
| Cuckoo CAC-F3010FW | 552 | 856 | 406 | $74.34 | 38% over minimum |
| Winix Tower XQ | 461 | 715 | 486 | $88.99 | 15% 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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