A short instructional monologue (YouTube video) explaining proper HVAC duct design: trunks should progressively reduce in size along the run so air pressure is maintained and airflow reaches the ends of branches. Speaker uses restaurant examples (Zaxby's, Red Robin) and a water-hose analogy to explain why improperly sized ducts lead to poor airflow in parts of homes (e.g., back bedroom).
If you go to like a Zaxby's or a Red Robin and you look up above in the ceiling, you will see the duct system. And what you'll see is a properly sized duct. You'll see it going big, small, smaller, smaller, all the way down. That's called reducing. That is a proper way to do it. That way the air pressure gets all the way down to the end of that run of trunk line so you can have air at the end. That is a proper way to do it. That's the way we do it. That's the way it should be done. Any engineered drawings you see that is the way it's done. And that is a problem in most homes we've gone to because the back bedroom or the side over here is not getting the airflow. Well, it's because the pressure has dropped. And if you think about it, it's kind of like a. It's kind of like a water hose.
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