High extraction rate. No matter whether you have an open-plan kitchen and living-room or a small, closed-off kitchen. We offer the optimum air volume for kitchens of all sizes. Air should be exchanged 6 to 12 times an hour to ensure a consistently pleasant ambience. On ducted models, 50 % of the noise is ducted to the outside. Bosch cooker hoods with the CleanAir module generate up to 3 dB(A) less noise than conventional recirculation systems while offering the same performance.