Convection ovens allow for even, fast cooking because the temperature stays more consistent, whereas conventional ovens can have pockets of warmer or colder air A conventional oven has heater coils in the bottom of the oven. Heat flows from the bottom to the top. In a convection oven, there are fans within the oven to help push air to all sides of the item being cooked. This allows for both convection heating (heat flow from the element) and convection cooking (via flowing hot air).