The 00643600 is a genuine OEM Bosch Cooling Fan. The Bosch 00643600 Cooling Fan fits the following brands of wall ovens: Bosch, Thermador The Bosch 00643600 circulates air through the oven control area to keep controls, wiring and other components cool during use. The 00643600 replaces: 00642843, 642843, 643600 It is recommended to either refer to your appliance service manual, contact your appliance manufacturer, or contact a service professional to validate the needed part number for your appliance prior to purchasing.