Four directly integrated and powerful Clean Air Plus odor filters for replacement needs. Optimized odor reduction, even for complex odor molecules such as fish. Large filter surface 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 6-12 months (non-renewable). Filters with optimized psychoacoustics. Easy to replace from above.