Most electric ovens have 2 fans. One is a fan forced fan at the back of the oven cavity that you can generally see spinning when the oven/fan forced option is selected. The other is a cavity fan which is situated between the outer skin of the oven and the oven itself. There are generally located at the top of the oven. Because the oven is a wall oven that sits in a tight cavity it cannot cool down easily. The job of the cavity fan is to cool this cavity down by blowing the hot air in the cavity out a small hole, normally in the front of the oven. When you turn the oven off this fan might operate for 5 to 10 minutes until the oven cavity cools sufficiently. If there was no cavity fan the oven and/or cupboard would overheat.
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