What is CADR?
CADR (m³/hr)
Clean Air Delivery Rate — volume of filtered air produced per hour.
Short answer
Some brands quote 'coverage area' at only 2 air changes — too slow for polluted cities.
CADR when buying a air purifier
Clean Air Delivery Rate — volume of filtered air produced per hour.
Why it matters: Room area (sq ft) x 1.6 ≈ CADR needed for ~5 air changes per hour.
Look for: Some brands quote 'coverage area' at only 2 air changes — too slow for polluted cities.
Full Air Purifier buying guide