The Designer Series HEPA Air Purifier with UltraQuiet Technology and Soothing Aromatherapy tray, helps create an optimal environment for sleep. Powerful, effective HEPA filtration with an intelligent, stylish design. The Certified Honeywell HEPA Filter captures up to 99.97% of microscopic allergens as small as 0.3 microns (1). The Activated Carbon Pre-Filter helps capture larger particles and helps to reduce VOCs & odours (2). The Honeywell Designer Series HEPA Air Purifier features a VOC sensor and Air Quality Indicator that illuminates the floor allowing you to see your air quality from across the room.(1) Captures the following allergens: dust, pet dander, pollen, dust mite debris and smoke from the air that passes through the filter, 0.3 microns and larger. Overall particle reduction depends on many factors including the amount of air processed, the pollutant type and the pollutant introduction rate into the environment.(2) When operated with the odour reducing pre-filter. It is recommended to always use the pre-filter when operating this air purifier. The filter should be replaced every 3 months to effectively reduce common odours and VOCs in a room.(3) Based on 3rd party independent CADR testing for the smoke CADR value, when operated at the turbo level. Air changes per hour calculations are based on the smoke CADR value x 60 minutes divided by the listed room volume (LxWxH) assuming an 8 foot ceiling. Air circulation depends on many factors, such as room size and configuration. There is no guarantee that all of the air in a room will pass through the filter.