Blueair 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, 6-12 months usage Condition:New 4 cm - Mouth

4 cm - Mouth

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Blueair 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, 6-12 months usage Condition:New 4 cm - MouthThe 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