This is my experience with windows on 2 24’ motorhomes.
First was my Sunseeker. It had a large sliding window by the dinette. That offered excellent ventilation. There was a tiny window on the other side that was almost useless for ventilation.
My Dynamax REV has 4 awning windows on drivers side and 2 awning windows on passenger side by the dinette. They offer good light and a nice view out. The ventilation is marginal because awning window don’t open as much as sliders.
We get a very nice breeze with the cab windows open which should be the same for any Promaster based van. Of course bugs can enter.
There is an emergency exit window in the rear bathroom. If I open that we get all the ventilation we could ever want when some of the awning windows are open.
Tiny sliders and awning widows offer little ventilation.
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