HVAC Ductwork Design Guide (Layout, Duct Size & CFM). 4. Design the Return Air Duct. Follow the same procedure as the supply air duct to design the return air duct. You need to install a return.
Ductwork Design Best Practices Keep it tight. Design ducts so none of the runs have to travel too far to reach a room or area. If that happens, occupants of that room are likely to complain that it’s too cold in the winter and too warm in the summer. Watch your routing. When possible, rout ducts through conditioned areas.
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