Abstract: A ventilation system for an oven is provided. The system includes a rear duct assembly. The rear duct assembly includes vertical walls defining a vertical air flow path along a rear of the oven, and a separator plate dividing the vertical air flow path into a first air flow configured to receive air from oven electronics and a second air flow configured to receive air from an oven cavity. The separator plate extends vertically downward between the vertical walls from the top of the vertical air flow path a portion of the height of the oven until a mixing zone at the rear of the oven into which the first and second air flows combine into a combined air flow.