I used the exhaust fan via range hood while cooking bacon a couple of weeks ago - worked well enough. Plus you can put the a/c on "fan" which works fine. As for the bunkends, we use those fan/light combos that plug into that little port at the ceiling at each end (like we had in the pop up). Those things are awesome. We have no issues with a lack of air movement inside.
All that is gold does not glitter,
Not all those who wander are lost.
Karen, Scott, our daughers (6 and 9), and Finley (Finn) the wonder lab.
2013 Jayco Jayfeather X23B
2001 Viking 2485ST pop up