Direct combustion is used in conveyored ovens or box type ovens. In the ovens designed by using specifically manufactured burners, there is no thermoblock unit and connected burner chimney. The entire energy produced by the burner is transmitted into the oven. In this way, there is no waste gas and heat thrown into the atmosphere, therefore there is a significant saving in energy costs. As in conventional ovens, precise temperature control and air circulation are also provided in these ovens.