Abstract: A conveyor oven is heated by inshot burners, which eliminate blowers, ducts, and motors heretofore required to supply a force draft of combustion air to the burners. Apertures in front of the inshot burners have a diameter that regulates the amount of combustion air that is delivered to the burners. The only blower in the oven is the one required to circulate and recirculate hot air within the oven which produces three pressure zones that causes an induced draft of combustion air for the inshot burner. A modulating valve adjusts the flow of gas to the inshot burners.

Abstract: A conveyor oven has a modulating gas valve which raises and lowers the thermal output of a burner that heats the oven. A bypass line passes a minimum amount of gas to prevent the burner from completely shutting down during periods while the oven remains above a threshold demand for more heat. Electrical isolation is provided between temperature controlling devices to prevent an electrical feed back which might otherwise prevent a complete shut down of the oven during hazardous conditions.

Abstract: A toaster oven has a double wall housing with an air space between the double walls. The inner one of the double walls has a plurality of openings therein arranged above and below heating elements inside the oven. Inside the oven, an air divertor having a pair of spaced parallel walls is positioned adjacent each opening. One of the spaced plates has perforations so that an air stream in the air space between the double walls is driven through the openings, the space between the parallel plates, and out the perforations. A food product is located to receive the air emerging from the perforations. The individual perforations have a funnel shape in order to concentrate the emerging air and better paint the surface of the food product.