Wolf Oven Fan Not Turning Off

The fan on my Wolf oven makes noise even after I turn it off. Is this normal?

Wolf’s electronic ovens and ranges use cooling fans to assure the components are protected from high temperatures. It is common for these fans to continue operating even after you have turned off the appliance. The fan will turn off when the temperature drops to a safe level. After self-cleaning, the fan may run for an hour or more.