【Fully Compatible】This Particle &Carbon Replacement Filt-er is compatible with Blue Pure 121 a-ir purifi-ers. 【Attention Please】This filter is only compatible with Blue Pure 121 air purifiers. ❌Not compatible with other models, please check your machine before placing the order. 【360-degree Filtration】360-degree air intake and 4x the filter surface area. Fresh the ai-r for you powerful& quickly 【Innovation technology 】Particle and Activated Carbon Filt-er clean particles down to 0.1 Micron gases pollen, dust, and pet dander. 【Permance Peak】replacing your fil-ter about every 6 months depending on usage. 【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. 121 Replacement Filt-er, Compatible with Blue Pure 121 A-ir Purifi-er, HEPA H13 Particle, and Activated Carbon Filt-er