How to Wire a 2 Speed Whole House Fan | Home Guides | SF Gate Flip off the circuit breaker controlling the room or hallway containing the whole-house fan. Test the Check the wall near the ceiling with a stud finder to find an area not near a joist, ideally above an Remove the retaining screw and pull the cover plate off the existing outlet. Remove the two screws Slit 6 inches of the plastic cover at each end of the cable and cut off the cover. Strip the insulation See all full list on homeguideste Whole House Fan Wiring Diagram Sample Collection of whole house fan wiring diagram. A wiring diagram is a streamlined standard pictorial representation of an electric circuit. It reveals the components of the circuit as simplified forms, and also the power and also signal connections in between the devices.