Yeah, I thought it was pretty dumb to just circulate the steam that way. There is no outside cooking exhaust vent on this RV. I thought maybe there was some hidden vent that I just hadn't found but they simply didn't build these RVs with them.
The Sharp microwave/convection oven is an all-in-one unit with a built in fan on the bottom to capture cooking steam from the range burners and, according to the installation manual I downloaded, it can be turned to either circulate or exhaust cooking steam. I'm thinking of adding the outside flapper/vent and routing the exhaust out through it. Just a little spooked about what structure or wiring might be right in the middle of a cutout. That could make for a very bad day indeed. Anyone know if a stud finder works on an RV? I think the frame on mine is steel but not sure.