Your guests are not alone in appreciating a relaxed cook. So you can chat with your guests while cooking, we have made our recirculation cooker hoods so quiet you hardly notice them. Generally, a swishing sound is generated by the noise of the motor itself and the air flow, depending on the level of counterpressure. 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. 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. To do so, the air delivery volume or power of the cooker hood must be appropriate to the room volume.