Derek Cole walks through how to balance HVAC system pressure by adjusting duct sizes and airflow. He covers specific transitions like reducing a 14-inch duct to 10 inches and explains why downstream components need to handle the remaining flow without creating bottlenecks.
You could go from a 12 down to a 8, or, you know what I mean, from a 14 down to a 10, depending on how much room you got, how much air you're taking off. If this duck here I handle, say, 1200, I know it'll handle everything I got on the system. If I need to take 6 off of this instead of 4, then I might go from a 14 down to a 10, because that all will be left. You know what I mean? I might not have to go from 14 to 12, 12 to 10. I just want to make sure that what's left when it comes out of here, this part here can handle it, and I can maintain the same static pressure and pressure to give balance airflow down through the system. So. But that's good questions.
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