Help with room ventilation

[Toad37]

You could put something like this in the door, one in the top and one toward the bottom

https://www.lowes.com/pd/Accord-Vent...-in/1000033685

Then you could control how open or closed they are and with a box fan blowing out thru one it should pull air in thru the other.

If the outer room has a/c it might pull in cooler air while pushing out how air, and you can close them up in the winter if needed.

This is kinda what I had in mind although I didn't think of putting 2. Thanks for the advice I might give the 2nd one a shot.