I installed one of those round vents right under my a/c blower and it has helped a lot, but it also cut off the flow on all the passenger side vents. if I close the round vent I will get some flow back to the passenger side. All in all I still like the round vent, pushes a lot my cool air then I was getting before and helps keep the MH cooler. I also got the Magna Shade, that helps a lot, but expensive.
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