Blueair Blue Pure 311 Auto Medium Room Air Purifier with Auto Mode for Allergies, Pollen, Dust Smoke, Pet Dander, Viruses And Bacteria with HEPASilent Technology and Washable Pre-FilterThe Blue Pure 311 Auto air purifier takes a simple approach to air quality management with an integrated particle sensor, Auto mode setting, and LED air quality display. The air purifier delivers high performance with one-button control and customizable pre-filter colors in a lightweight, compact package. Independently evaluated and third-party tested for performance as part of the AHAM Verifide® Program for room air cleaners, this air purifier has a Clean Air Delivery Rate (CADR) of 250 for fine smoke particles, 250 for NULL particles, and 244 for NULL particles. Recommended for medium rooms like a master bedroom, living room, or playroom with a 360° air intake to completely filter room air about every 12 minutes (5x an hour at 388 ft²) on the highest speed. The 3-step combination particle + carbon filter works with Blueair’s HEPASilent™ filtration technology to remove 99.97% of airborne particles down to 0.1 microns, like NULL, NULL, pet dander, NULL, NULL, NULL⁰ and more, while an additional layer of activated coconut carbon traps light household NULLs. The one-touch enabled Auto mode is designed to help you maintain a comfortable and safe home environment. When enabled, the setting automatically adjusts to real-time conditions reported by the integrated particle sensor. Stay up to date on your air quality with the LED display; it changes color to indicate good, moderate, or poor. The Blue Pure 311 Auto cleans the air with noise levels equivalent to a soft whisper on low (23-53 dB), and ENERGY STAR rated energy efficiency (3-35 W). Change color in seconds with five fabric pre-filter options inspired by Scandinavian nature. The fabric material of the pre-filter catches larger particles and extends the life of the primary filter. Plus, a hidden compartment in the fabric pre-filter keeps the power cord hidden out of sight. Vacuum the fabric or toss it in the washing machine whenever it needs cleaning. Pre-filter in Arctic Trail (gray) included; Additional colors available for purchase. At Blueair, our Swedish heritage inspires sustainability and quality at the heart of everything we do. All Blueair purifiers are AHAM Verifide® for Clean Air Delivery Rate (CADR) and given a recommended room size, ENERGY STAR rated, and tested by the California EPA Air Resources Board (CARB) for safe ozone emissions. ​ ⁰This air purifier not been tested against CoronaNULL, and Blueair does not claim to capture, remove, or kill 2019-nCoV. ​Blueair Blue Pure 311 Auto Genuine Replacement Filter, Particle and Activated Carbon, Fits Blue Pure 311 Auto Air PurifierGenuine Blueair Replacement filter compatible with Blue Pure 311 Auto air purifier. The Combination Particle + Carbon filter protects against both gaseous and particulate contaminates. Advanced polypropylene filter media removes particle pollutants from your indoor air, such as pollen, dust, and pet dander. At the same time, a layer of activated carbon mesh traps light household odors from pets, cooking, smoke, and more. The 360-degree design allows the filter surface area to be over 13 square feet in size. Unlike look-a-likes, authentic Blueair replacement filters are designed to maintain premium performance over time and ensures your warranty remains intact. For optimal performance, replace the filter about once every six months when used 24 hours a day. The twist-and-change filter is easily removed and replaced and is recyclable at the end of its service life. Please check your local recycling facilities for availability.