The Blue Pure 211+ 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 350 cfm for fine smoke particles, 350 cfm for pollen particles, and 350 cfm for dust particles. Recommended for large rooms such as large living rooms, family rooms & playrooms with a 360° air intake to completely filter room air about every 12 minutes (5x an hour at 540 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, including pollen, dust, pet dander, mold, bacteria, viruses¹ and more. The filters additional layer of activated coconut carbon traps light household odors from pets, cooking, and smoking. The Blue Pure 211+ cleans the air with noise levels equivalent to a whisper on low (32-56 dB) and is ENERGY STAR rated for energy efficiency (30-61 W). Change color in seconds with five fabric pre-filter options. The fabric material of the pre-filter catches larger particles and extends the life of the primary filter. Vacuum the fabric or toss it in the washing machine whenever it needs cleaning. Pre-filter in Diva Blue (blue) and Dark Shadow (dark gray) included; Additional colors available for purchase.