Air purifier for a 100 sq ft room

Minimum smoke CADR: 67 cfm with an 8 ft ceiling, 75 cfm at 9 ft, 83 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.

120 qualifying models, cheapest to run first

*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.

107 of these have at least 50% headroom. Not sure of your room size? Use the room calculator.

Other sizes: 150 sq ft · 200 sq ft · 250 sq ft · 300 sq ft · 400 sq ft · 500 sq ft · 600 sq ft · 800 sq ft · 1000 sq ft