an air return system for a rotatable rack baking oven having a heat source and a blower associated therewith for providing a flow of heated air across a baking chamber of the oven . the outlet end of the blower is connected via ductwork to an air outlet vent which introduces the heated air into the baking chamber . the air outlet vent includes a lattice of fixed vanes which are elongated in the direction of intended air flow . this arrangement channels the heated air to exit normal to the outlet vent to maintain a well defined column of air with less turbulence . an air return vent is located opposite the air inlet vent and is operatively associated with the heating means and the inlet side of the blower . the air return vent includes a panel having a plurality of holes through which the air may be drawn . a number of return holes in the return vent are blocked such that their numbers vary in inverse proportion to the drawing force produced by the inlet of the blower . this produces a uniform draw of air from the baking chamber , aiding in the uniform flow across the chamber .