Abstract: An oven for treatment of food comprises an oven chamber (12), means (19, 21, 23) for heating of the air in the oven chamber, and fan means (32) for circulation of the heated air in said chamber. The fan means (32) is a cross-flow fan with an impeller (34) provided to rotate freely without a surrounding fan housing. The impeller (34) is provided with fan blades (42) of a design such that a slowly rotating air jet (49) is created which has a direction of rotation which equals the direction of rotation of the impeller (34). Alternatively, the fan blades (42) may have a design such that a slowly rotating air jet (49) is created with a direction of rotation opposite to that of the impeller (34).