Product review (1 stars): Do not buy Kitchen Aid ovens.  The fan noise is terrible.
We have had this oven for several years now. It has a major design flaw. When using the oven the air is recirculated in either normal or recirculate mode. The fan has a loud whining noise that will drive you out of the room. I researched this problem on the internet and found many very unhappy customers and that nothing can be done about it. That's the way it is designed!  Kitchen Aid should be ashamed of the brand for putting ovens like this on the market.  Buy another brand.