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Built-in ionizer revitalizes air. Auto power shut-down protection when back cover is removed-provides extra safety. Low power consumption-energy efficient. *Clean Air Delivery Rate as defined by ANSI standards. CADR measures the amount of particle-free air being delivered into the room. Therapure® 300D air purifier boasts a CADR of 180 – an outstanding performance for an air purifier. know your Therapure® 300D MAIN PARTS 1. Permanent HEPA-type filter: Removes airborne particles as small as 0.1 m