Signature Blue 4.0 Replacement Filter Large, HEPA Filter Particle + Carbon + OdorFence, Genuine Replacement for Blue 4.0 Series, Removes 99.97% of Airborne Particles, 6-9 months usage

The Blue 4.0 Signature Replacement Filter is our most advanced HEPA filtration system yet. Powered by OdorFence molecular neutralization technology, it outperforms traditional carbon filters in eliminating stubborn odors. Combining HEPASilent technology with OdorFence™, this filter features a 7-stage purification process integrated into three high-performance layers: a fabric pre-filter, a multi-layer filter media, and an enhanced carbon filter. What sets this filter apart is its intelligent use of specialized elements: * Bio Enzymes, invisible to the eye, are embedded in molecular sieves to effectively neutralize pet odors like ammonia. * Molecular Sieves (yellowish particles) target and absorb scents from perfumes and cleaning agents. * Permanganate beads (reddish-purple) tackle harsh odors such as those from cigarette smoke and bathroom environments. * Activated Carbon Pellets (black, cylindrical) capture a wide range of chemical odors, including those from cooking and household fumes—engineered in pellet form to maximize surface area and absorption capacity. Together, these elements make the Blue 4.0 filter a powerful solution for cleaner, fresher indoor air. • HIGH EFFICIENCY FILTER: Blue 4.0 Signature filter provides protection against odors, chemicals, gases and 99.97% of airborne pollen, dust and germs. • ODORFENCE TECHNOLOGY: Powered by OdorFence molecular neutralization technology, it outperforms traditional carbon filters in eliminating stubborn odors. • LAYERS OF ODOR FILTRATION: Bio Enzymes neutralize pet odors, Molecular Sieves absorb cleaning agents, Permanganate beads tackle smoke and bathroom smells, and Activated Carbon Pellets capture a wide range of chemical odors, including cooking fumes. • MINIMIZES ALLERGENS: The particle filter layer helps to minimize the airborne particles that can trigger allergy symptoms, including pollen, dust, mold spores, pet dander, viruses, bacteria, and fine smoke particles. • FILTER CHANGE NOTIFICATION: The built-in LED warning system on the purifier turn on as well as Blueair App will notify when it's time for a change. No more guess work.