i am planning on putting max air vents on t/t roof. i have to ask , do the vents face back , so in travel, air blows over them when travelling. i have that magical kithen fan that closes when it rains. the bath and ft. bedroom are the ones for cover upgrade . is it hard to wire a roof vent to a power vent ? i have to asumme that there is no wiring and running wires would be next to impossible .