Derek Cole explains how to balance HVAC duct systems by progressively reducing trunk lines and using end caps to create back pressure. Dead-heading and poor run placement cause some ducts to starve while others get too much air, making individual fixes nearly impossible.
Just like a duct system, where you got a trunk line coming through here, and it's reduced as it goes, and reduced as it goes. And it comes to an end. You come back from that end cap a little bit before you put your first runs, because that air hitting that end cap is what pressurizes that duct system. It gives it back pressure into that duct system, which allows you to have a more balanced airflow. If I've got runs all over this side and I'm dead heading into here, up against this wall, you don't know which run is going to be to pass the least resistance. And you're going to have some that might not get any air, because it might be down in the corner somewhere or something like that, and then some that are getting way too much air. Then be honest with you, there ain't a correct way to balance one on a box.
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