I have the rvairflow installed in our travel trailer and was pretty happy. However when we installed on in our coach, we were less thrilled than we had hoped.
The concept is good, but I felt there was a much simpler solution that would also allow us to keep the dump vents. Looking at the Dometic return grills, we knew the solution. It is documented here with the results.
https://www.thorforums.com/forums/f2...ent-31750.html