Method of heating food

The method of heating food in a convection oven, comprising:

• placing the food in a pan;
• inserting the pan containing said food through an access opening in a convection oven into a compartment in the oven at the lower end of a ductwork system in the oven, said ductwork system comprising an air delivery passage, adapted for delivery of air from a lower end thereof down into the pan in said compartment and an air return passage extending up from the lower end of said ductwork system, interengaging the pan, all around the pan, with the lower end of said ductwork system to cause the pan to cooperate with the air delivery and air return passages in the ductwork system and to form a generally closed passage, including the pan and the air delivery and air return passages, through which heated air is confined to flow from the air delivery passage to the air return passage, and
• flowing heated air down through the air delivery passage into the pan, through the pan, and thence up and out of the pan through the air return passage, with substantially all of the heated air exiting from the lower end of the air delivery passage flowing through the pan and over and around the food in the pan and thence up and out of the pan through the air return passage.