It doesn't matter whether you have an open-plan kitchen or a small closed kitchen. For a uniformly pleasant room climate, the air should be completely exchanged 6 to 12 times per hour. To achieve this, the air flow rate or the performance of the cooker hood must correspond to the room volume.

Metal grease filters are required for exhaust and recirculation hoods to filter grease and other solids from the intake air. To maintain their high efficiency, they should be cleaned by hand or in the dishwasher about once a month.