:thumbsup: Cactusman I attached a photo of the setup. It is sealed but only by gravity and weight. The glass slides into an opening on one side and has a metal tab that swings down to hold in place. There is 4" flexible duct going into one of the vents and the same size coming out. Then the duct goes to the active exhaust where I have had a 80 cfm and a 240cfm fan. Still the same temps???? Also there is a 6" passive intake going into the cab with two other active exhaust going out. I have each of them with 80cfm duct fans sucking as well. If you are facing the cab the lower right side has the intakes and the top left side is where all the exhaust are located.