A fan does not cool anything. A fan displaces/disperses air. If the air it full comes from a cooler the place you have a cooling affect. Or if an object is generating radient heat bowing air on it will remove the layer of heat allowing more heat to be transfered from that object into the air. But the heat is still in the room and it is going up its just dispersed or moved.
You my friend ar fighting a loosing battle. Circulating fans will actually raise the temperature a very small amount if anything. Without activing cooling your box will never be cooler than the rooms ambient temp the cab resides in. Unfortunately your cpu fan wont do jack. I apoligize for those 2 recommendtaions, i dont think they read you post correctly. Unlimately you need a source of cooler air.