Oven for cooking foods, which comprises: - a containment body, which defines a cooking chamber and is provided with an upper wall and with a lower wall between which said cooking chamber is extended height-wise; - at least one fan provided with a rotation axis, arranged in said cooking chamber and actuatable for generating at least one air flow within said cooking chamber; - a dividing separator, which is extended in said cooking chamber between said upper wall and said lower wall according to an extension direction, said dividing separator separating said cooking chamber into a ventilation space, in which said fan is arranged, and a cooking space, in which foods to be cooked are intended to be arranged, said dividing separator being provided with at least one suction opening, through which said fan is adapted to suction said air flow from said cooking space towards said ventilation space; wherein said at least one suction opening of said dividing separator is distributed along said extension direction in a manner such that said dividing separator has spatially-variable resistance to the air flow at least along said extension direction; wherein the resistance to the flow of said dividing separator decreases in moving away from the rotation axis of said at least one fan; wherein said dividing separator is provided with a distribution interspace, which is arranged between said ventilation space and said cooking space, extended at least along said extension direction between said upper wall and said lower wall, and is connected to said ventilation space by means of at least one passage opening, and to said cooking space by means of said at least one suction opening; wherein said dividing separator comprises: - a separation wall, which is provided with said at least one passage opening; - a distribution wall extended at least along said extension direction, passing in front of said at least one passage opening, said distribution wall delimiting, with said separation wall, said distribution interspace and being provided with said at least one suction opening; said oven being characterized in that said dividing separator comprises at least two lateral walls, which are placed to connect between said separation wall and said distribution wall to laterally delimit said distribution interspace which is extended, transversely to said extension direction, between said lateral walls. - a containment body, which defines a cooking chamber and is provided with an upper wall and with a lower wall between which said cooking chamber is extended height-wise; - at least one fan provided with a rotation axis, arranged in said cooking chamber and actuatable for generating at least one air flow within said cooking chamber; - a dividing separator, which is extended in said cooking chamber between said upper wall and said lower wall according to an extension direction, said dividing separator separating said cooking chamber into a ventilation space, in which said fan is arranged, and a cooking space, in which foods to be cooked are intended to be arranged, - a separation wall, which is provided with said at least one passage opening; - a distribution wall extended at least along said extension direction, passing in front of said at least one passage opening, said distribution wall delimiting, with said separation wall, said distribution interspace and being provided with said at least one suction opening;