QUIETPURE Compact Air Purifier with ACTIVEPURE Technology. Perfect for Bedroom, Office, and Small Rooms. Provides 2.4 air exchanges/hour within 2000 cubic feet (250 sq. ft x 8 ft high ceiling) Ultra-Quiet Desktop Operation; Features a HEPA filter with Activated Carbon and ActivePure Technology developed by NASA Removes and destroys over 99.7% of particles 0.3 microns and larger, such as dust, pet dander and pollen Eliminates smoke, odors, and mitigates mold and fungi NASA developed ActivePure Technology recognized by the Space Foundation and approved for use aboard the International Space Station