The only precaution to follow are: – The cooking temperatures of the different foods must be as close to as possible, with a maximum difference of 20° - 25 °C. – The introduction of the different dishes in the oven must be done at different times in relation to the cooking times of each one. The time and energy saved with this type of cooking is obvious. How to use the Convection Oven (top oven) How to use the Convection Oven (top oven) Attention: the oven door becomes very hot during operation.