I have an old existing bathroom exhaust fan, light and heater. I want to replace this with just a new exhaust fan and light without the heater. Please advise how I should do the wiring since I will not need the wires for the heat blower. My question was how can I determine how to do the wiring? How do I know what wires are for the heater which I will no longer need ? What wires I will need to connect to my new bathroom ceiling exhaust fan with light ?