5 will get you 10 thats not a cooling plate but rather a piece of metal that controls the airflow. Cold air has to go to the top of the tower, then return if it's going to keep the beer cold all the way to the top of the tower. That metal thing is probably a divider that separates the supply air from the return air. Just my 2 cents. Say what you want to do cooling-wise and this forum will set you up correctly.
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