Our 2004 Rockwood came with the Apollo microwave/convection oven/range hood vent. Just like yours, it recirculated the hot air (and moisture) from cooking back into the TT.
After a few years of this, I removed the Apollo and looked at the rear of the unit. You could switch it to vent outside by moving a baffle inside a compartment. Of course, I had to put a rectangular hole in the wall and used a vent simoilar to the JR vent you mention. Also, I used aluminum duct tape like someone mentioned.
It was much better venting to the outside. Now the AC doesn't have to fight the heat from the stove as much. The vent was still weaker than it should be because the fan wasn't very strong and the suction area with filter was a small size.
Finally, the Apollo died (after fixing it a few other times) and I had enough. I took it out and installed a shelf so I could put a regular microwave (or convection oven) on it. I went on Ebay and bought a 12VDC RV range hood with light for $40. I vented it to the outside (unfortunately a new hole was required as it was a lot lower) and it works much better. As a bonus the vent works on 12VDC, so I can vent out even if on battery power. The Apollo vent was 120vac only.
Steve
