A convection oven is provided with a fan for circulating air in the cooking chamber of the oven. The food is held in a food holder which is attached to but spaced from the inside surface of the oven door. Heating elements are at the top and the bottom of the cooking chamber. A flue opening is in the bottom of the cooking chamber and the heating elements are positioned above the lengthwise lower ends of the flue opening for inducing external air around the lower heating elements and the lower surface of the food and food holder. A method is disclosed for introducing external air into the bottom of a convection heating oven, to cool the lower surface of the food in the oven and provide turbulence to the circulating air for enhancing the cooking of the food.