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The general types of supply duct systems include: radial system extended plenum system reducing plenum system reducing trunk system perimeter loop system. There are many types of ductwork available and often times the ductwork. It is important that the ductwork is designed and installed correctly. Velocity Classification​​ Ducts are classified into 3 basic categories: Page 6 PDHcenter.com PDH Course M246 PDHonline.org 1. Low Velocity Duct Systems: Pressure Classes ½, 1, 2. Pressure Class 3. Pressure Classes 4, 6, 10. Transfer Air Ducts. Outdoor Air Ducts. Return Air Ducts. 0.10 to 0.15. 0.20 to 0.25. FLUID RESISTANCE. Duct system losses are the irreversible transformation of mechanical energy into heat. The two types of losses are (1) friction. Types of Ductwork. • Round Metal: Minimal air pressure loss retards growth of fungus and mildew; joints leak unless well sealed; must be insulated (in.efficiency not equaled by other forms of duct insulation. By enabling ducts to transmit heated or cooled air to occupied spaces at design temperatures,