【Perfect Fit】This 511i max AllergenBlock filter replacement is designed exclusively for the Blue Pure 511i Max Air Puri-fier. Please check your model before buying. 【High-Efficiency Filtration】The True H13 HEPA filter can clean 99.99% of airborne particles as small as 0.1 microns, including dust, pollen, pet dander, keeping your home fresh. Equipped with a premium granular activated carbon filter, it can physically adsorb stubborn household odors and fumes from cooking, pets, smoke, and VOCS, creating a healthier environment, especially for families with children or pets. 【AllergenBlock Coating, Perfect for Sensitive Individuals】This coating effectively traps over 90% of irritants, making it ideal for asthma sufferers and those with sensitive respiratory systems. It captures airborne debris to reduce symptoms like sneezing, coughing, and sinus irritation caused by indoor pollution. Ideal for those with sensitivities and perfect for anyone wanting cleaner air, these 511i max AllergenBlock filters keep your living space fresh and clean. 【Maintain Peak Performance】The package includes 2-pack Blue Pure 511i Max AllergenBlock filters. To ensure your Air Puri-fier operates at its best, we recommend replacing it every 6 months under normal usage conditions. 【24/7 Support & Customer Satisfaction】Our Blue Pure 511i Max Replacement Filter is easy to install, no tools needed. If you have any issues, our dedicated team guarantees a 24-hour response and effective resolution.