Perfect Compatibility: Blue Pure 411i Max Replacement Filter Perfectly Fit for 𝐁𝐥𝐮𝐞 𝐏𝐮𝐫𝐞 𝟒𝟏𝟏𝐢/𝟒𝟏𝟏𝐚 𝐌𝐚𝐱 smart machine. 𝐍𝐨𝐭𝐞: 𝐍𝐨𝐭 𝐜𝐨𝐦𝐩𝐚𝐭𝐢𝐛𝐥𝐞 𝐰𝐢𝐭𝐡 𝐁𝐥𝐮𝐞 𝐏𝐮𝐫𝐞 𝟒𝟏𝟏+,𝟒𝟏𝟏 𝐀𝐮𝐭𝐨 & 𝐌𝐢𝐧𝐢 High-Efficiency Particle Filtration: Blue Pure 411a Max Replacement Filter for Blue Pure 411i/411a Max, featuring high-efficiency activated carbon and fine pre-filter. It absorb 99.97% filtration down to 0.3 microns, safeguarding you from household odors. Valuable Package: Includes 2 filters compatible with Blue Pure F4MAX. 100% brand-new and high-efficiency. All necessaries are provided to finish the standard installation smoothly without any tools required. Optimal Performance Maintenance: For ongoing top performance of your Blue Pure 411i/411a Max, we recommend replacing the filter every 6-9 months subject to your usage frequency. Exceptional Customer Service: Should you have any inquiries about the Blue Pure 411i/411a Max Replacement Filter, feel free to contact us anytime. We strive to deliver high-quality products accompanied by top-notch customer service. Blue Pure 411i/411a Max Replacement Filter Compatible with 411i/411a Max Air Pu-ri-fi-er, Efficient Particle Dust Dander Filter&Odor Smoke Activated Carbon Filter for Home, Blue Pure F4MAX, 2 Pack