Abstract: A baking oven and method for controlling the exhaust flow from a cooking chamber of the baking oven. The exhaust flow is discharged from the oven by a fan. The method includes increasing the speed of the fan and measuring the gas concentration of the cooking chamber during a first time interval. The gas concentration is measured using a gas sensor. At the beginning of the first time interval, an initial gas concentration is measured. During the first time interval a fan speed is selected at which the measured gas concentration varies from the initial gas concentration. The speed of the fan is set for a second time interval as a function of the selected fan speed from the first time interval.