Yes. The unit and controls can be at the entrance from the rooms into the chimney, and you’ll need to cover the top of the chimney to get flow from room to room, and put air filters in-between the fans and the chimney if it has ever been used. If you want to get a little fancier, you can have the top of the chimney open and close so that you can pull air from outside or vent air out of both areas…