This oven is designed with the recirculation fans and combustion chamber installed on top of each oven zone in the “penthouse” section. The air is heated in the combustion chamber and a fan forces/blows the heated air into the bake chamber through the Airflow Dispersion ductwork to ensure even baking. Baking is achieved using a re-circulating air technique. The oven is heavily insulated for up to 650 °F (340°C) operation.