Every Purchase Saves Pets. proudly supports Pet Foundation and its mission to help save homeless pets.3 Stage Filtration. Includes a fabric pre-filter, an activated carbon filter and a HEPA filter.Automated CirQulate System. Monitors and provides colored-coded, indoor air quality feedback and adjusts to the appropriate fan speed.Peaceful Sleeping Environment. Whisper-quiet fan speed option and automated night mode make it the perfect addition to bedrooms.Integrated and Functional Design. Complements any living space with front panel filter access, convenient and discreet cord wrap, and intuitive controls.Accommodating Size. Tested to the AHAM standard to have a Smoke CADR (clean air delivery rate) of 172 for rooms up to 266 sq. ft., making it great for bedrooms, living areas, basements, and dining rooms.