Can anyone provide guidance as to where I should install a vent fan on the roof of my van?
I have a GM full-size cargo van (Chevrolet Express/GMC Savana), standard wheelbase. The length of the roof is approximately 137 inches.
I will be installing a MaxxAir RV vent fan:
From a ventilation standpoint, I would like the vent fan to be as far back as possible because while the doors are closed the only inlet of fresh air are the two front windows. I don't think my intuition is worth much when it comes to aerodynamics, but I suspect the drag penalty will increase significantly the closer the vent is towards the very rear of the roof.
That being said, this model is designed in such a way that it can be left in the open/raised position while driving. I have no idea how I should factor that in! I'm inclined to think it will be closed the majority of times I'm driving at highway speeds.