I apologize right off the bat for the sideways picture. I tried every way I knew how to get it to save rotated correctly but could not.
With that said, I have an Atwood 8525-IV-DCLP furnace with the below vent. I cannot find a screen for this. The screens for 8500 series have the bump part in lower right hand corner. As you can see, it is right in the middle. The intakes around the edge are about 3 1/2 inches square and the vent sticks out about 1". Do any of you have the same thing and what did you use?