This is an inexpensive experiment for me with a different style cover. There are more expensive models available that are powered or even have additional fans, but their complexity begs for failure. I've used vent covers on all my RV's and would not go without one, but I am open to new designs. Is anyone else using a different style vent cover than the typical one open in the rear? Camping World has this one on sale for $20 with side venting:
http://www.campingworld.com/shopping/item/camping-world-vent-cover-translucent/70083This model is over $90: