Blueair Classic Replacement Filter, 400 Series Genuine Particle Filter, Pollen, Dust, Removal; Compatible with Classic 402, 403, 410, 450E, 455EB, 405 It is important to only use genuine Blueair replacement filters to maintain optimal performance and warranty. Filters that are not Blueair genuine will void your units warranty. Genuine Blueair Replacement Filter is compatible with Blueair Classic 402, Blueair Classic 403, Blueair Classic 410, Blueair Classic 450E, Blueair Classic 455EB, Blueair Classic 405 Particle filter reduces pollen, dust, pet dander, mold spores, viruses and bacteria. Reccomened to change filter once every 6 months, or dependent on usage. This filter be recycled after it's changed. Energy saving Blueair air filters save energy due to a low-density design and requiring less pressure to push air through the filters. The filters are also 100% recyclable, so the only thing youre adding back into the environment is clean air. Fits all Blueair model air purifiers in the 400's Bacteria-Resistant filter media