this looks great. what did you use for this cover? steel or aluminum?I think my vent cover is in its final form. We had some freezing rain recently and with one notch in the middle there were two spots of ice at about 10:30 and 1:30 near the top of the windshield, each about 6 inches in diameter. I cut two more notches near the ends of the cover and I'm getting good airflow at 10:30 and 1:30. I'm calling it good.