Thank you for the links and information. The photos do not show it well, but my shelter does in fact have a sloped double roof arrangement. I built this shelter several years ago, and it has served me well. The fan aspirator is probably not even necessary, but I wanted to try and set something up anyway. The temp spikes are really only noticeable during the peak sun, >100F deg. days.
The whole fan and solar panel setup was around $25 from Amazon, so I figured that I would give it a shot and experiment.