【Fully Compatible】: This 211i Max replacement filt-er fully compatible with BLUEAIR Blue Pure 211i Max Air Pu-rifier; 【Attention Please】:This Filter is ONLY compatible with a 211i Max Air Purifier, Not ❌compatible with 211+ and 211+ Auto, 411i max, 411ia, 511, 311, 121, or other models, Please check the model number before placing the order; 【High Efficient Fil-lteri-ng】：The HEPA filter Clean at least 99.97% of tiny airborne particles like smoke down to 0.1 microns, and cleans pet dander, and dust, The activated carbon filt-er clean light household odors from smoking, pets, and cooking fume; 【Performance Peak】：For your machine performance peak, based on actual usage the filter should be replaced within 9 months, it's easy to install, and no tools are required; 【We Treasure Our Customers】: If you have any questions about our product, please feel free to contact us, and we'll solve them within 24 hours. Filter made of FSC-Certified paper. 2 Pack 211i Max Replacement Filter Compatible with BLUEAIR Blue Pure 211i Max Air Purifier, Ture HEPA & Activated Carbon Replacement Filter, Blue