Large room coverage, recommended for rooms up to 915 square feet. Delivers 915 square feet at 3 Air Changes Per Hour (ACH) and 549 square feet at 5 ACH. Allergy protection with H13 True HEPA Filtration captures up to 99.95% of particles as small as 0.1 microns, including allergens, such as pollen, dust and pet dander. Pre-filter removes visible airborne particles, carbon air filter actively removes pet odors, smoke odors and volatile organic compounds. AeraSmart™ Sensor monitors air quality and automatically adjusts the fan speed to keep your air purified-Quiet Operation. Three-speed fan with 24-hour, ultra-quiet operation.