I bought a new house that was prewired for a ceiling fan. I uncovered the plate for the fan box, and discovered wiring consisting of a white, black, red, and ground wire. The ceiling fan has a black wire, white wire, blue wire, and ground wire. There is no light fixture to this fan. I'm not sure which wires to connect. The ground to ground. The blue is not used. But what do I connect the black wire to and the white wire to from the fan?