Product review (4 stars): I am pleased with the results and will be making a more ...
I actually used this as a vent for a portable floor standing air conditioner.  I had the vent hose, but no hardware for the window.  As the back side of this vent (the non-louvered side) has a round connection that was exactly the same size as the hose, I used duct tape to secure the hose to this louver vent.  I made a temporary board to fit the window and attached this louver to it.  I am pleased with the results and will be making a more durable board adapter for the window.