Jayco runs the 120 wire to that roof vent area. They also have a knock out to connect to the existing ducting. Depending on the model, they may have the tstat cable run from that vent to a common wall area, but you have to call Jayco for the exact location for your model. You will see the wiring if you remove the 4 screws for the inside vent Garnish. You will have to connect the 120 wire to the 20 amp breaker in the main breaker box. The wire is usually just bundled up behind the breaker box. You pull the breaker box to find it and route it into the breakers. Doug