An extension rack assembly is mountable within and removable from a consumer appliance side walls. The extension rack assembly is movable between an overlapped position and an extended position. A mechanism is provided for automatically securing the extension rack assembly in the consumer appliance when the extension rack assembly within the side walls is moved from the overlapped position to the extended position and for allowing removal of the extension rack assembly when the extension rack is maintained in the overlapped position and slid from the side walls. The extension rack assembly may also or alternatively be configured to receive a rack in a first orientation having a first height within the consumer appliance and in a second orientation having a second height within the consumer appliance