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A convection oven (also known as a fan-assisted oven or simply a fan oven) is an oven that has fans to circulate air around food to create an evenly heated environment. The increased air circulation causes a fan-assisted oven to cook food faster than a conventional non-fan oven, which relies only on natural convection to circulate the hot air.[1] Fan-assisted convection ovens are commonly used for baking as well as non-food, industrial applications.

A tabletop convection oven cooking pork. For slower cooking, the gridiron here has been reversed to place the meat low and far from the main heat source (at the top of the pot), although near the heat of the glass pot's bottom. Flipping the gridiron would raise the meat closer to the main heat source.
An industrial convection oven used in the aircraft manufacturing industry

When cooking using a fan-assisted oven, the temperature is usually lower compared to that of a non-fan oven, often by 20 °C (40 °F), to avoid overcooking the outside of the food.

In the context of ovens, the term "convection" is widely used to mean "fan-assisted", but this is perhaps not the most precise way to differentiate fan-assisted ovens from conventional ovens, since both types of oven cook using convective heat transfer (transfer of heat due to the bulk movement of hot air). Conventional ovens circulate hot air using natural convection and fan-assisted ovens circulate hot air using forced convection, so scientifically the term "convection" applies equally to both conventional (natural convection) ovens and fan-assisted (forced convection) ovens.