Four directly integrated and powerful Clean Air Plus odor filters in recirculation mode for replacement needs. Optimized odor reduction, even for complex odor molecules like fish. Large filter surface area with high capacity for odor reduction. Anti-pollen function: The filter retains an extremely high amount of airborne pollen and deactivates allergens captured by the filter. Lifespan of 6 to 12 months (non-reusable). Filters with optimized psychoacoustics. Easy to replace from the top.