Performance characterization of air mixing devices for square ducts

Relation between Velocity and Pressure in Circular and Non-Circular Shape Duct for Local Exhaust Ventilation (LEV) System

“…Circular ducts have traditionally been used in systems because of their benefits, including efficiently transporting flowing air with less friction, more accessible and faster installation, less noise, and a lower initial cost. On the other hand, round ducts require more height than rectangular or square ducts; thus, rectangular or square ducts are preferable in many HVAC (Heating, Ventilation, and Air Conditioning) applications when space is limited [3]. Pressure loss and velocity are two aspects of air system balance, which are concerned with duct sizing during the design phase and testing, modifying, and balancing after installation.…”