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 ).
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