- COMPATIBILITY: Designed specifically for Blueair 411i Max and 411a Max Air Purifiers. This premium Blue Pure F4MAX Replacement Filter is not suitable for models 411, 411+, or 411 Auto. - 2-IN-1 FILTRATION: Features advanced HEPASilent and Carbon dual filtration technology, effectively delivering cleaner air more quietly and efficiently than standard HEPA filters. Enjoy a healthier home environment with less energy consumption. - PREMIUM F4MAX FILTER: Captures at least 99.97% of airborne particles down to 0.1 microns, including pet dander, pollen, dust, and fabric fibers. The integrated carbon filter neutralizes household odors from pets, smoke, and cooking, ensuring your space smells fresh. - DURABLE QUALITY: Crafted for longevity, this filter maintains optimal performance for your 411i Max and 411a Max Air Purifiers. For best results, replace the filter every six months to ensure continuous air quality improvement. Use Scenarios: 1. Pet Owners: Effectively removes pet dander and odors, creating a cleaner and more comfortable living space. 2. Allergy Sufferers: Reduces allergens like pollen and dust, providing relief during allergy season. 3. Cooks and Smokers: Eliminates cooking smells and smoke, ensuring your home remains inviting and odor-free. Enhance your indoor air quality with this reliable and efficient filter, designed to meet the specific needs of your air purifier.