Aside from the main equipment in the kitchen such as the oven, stove and toaster, the kitchen sink and the dishwashers are also considered to be sources of odor, moisture and heat. In kitchens, it is not enough to simply suck the air out and extract it, also fresh air must be supplied. The fresh air that is supplied to the kitchen is heated at the ambient temperature within the unit. During the summers, the temperature control in the kitchen is provided by the amount of ventilation. In better application, an air handling unit is used to cool the air. Additionally, at least EU 3 quality filters must be utilized in the fresh air unit. In roof-mounted fans, the condensed and collected oil must be safely drained out without contaminating the roof. The exhaust fans are recurvate centrifugal fans. It is acceptable to use special roof-mounted fans and also a set of fans that are mounted on a constructed platform. At the outlet, the exhaust air must be thrown out with a vertical speed of 10-13 m/s from the highest point of the roof. In this way, it is
ensured that the odor does not cause any inconvenience to the neighbors. Furthermore, the wind direction must also be taken into account. Exhaust ducts that go through cold and unheated zones must be insulated against condensation.