Breathe cleaner, fresher air with Bionaire. The Bionaire Medium Room True HEPA Air Purifier purifies the air using a 360-degree air intake system to efficiently capture air from all around a room. The 360-degree filter works to clean your air in 3 stages. The first stage captures large particles like hair and dust in the pre-filter. In the second stage, small particles as small as 0.3 microns pass through the True HEPA filter, which removes up to 99.97% of airborne allergens from the air including smoke, mold spores, pet dander, pollen, dust mites, and bacteria. Finally, in the third stage, the carbon layer eliminates common household odors such as cooking fumes and pet odors. This True HEPA air purifier can clean the air in spaces of about 155 square feet, making it ideal for most bedrooms. Features a low/quiet setting that allows it to continue cleaning the air throughout the night without disturbing your sleep.