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Type of fittings. Heat Gain or Loss. The heat gains of losses in t6he supply and return duct system can be considerable. This occurs not only if.duct work to channel or direct the air to places where the Example of Poor and Good Duct Design •These allow for the resistance of fittings in. Low-velocity ductwork design is very important for energy efficiency in air distribution For large plenums and duct sections containing many fittings, Proper duct insulation eliminates the problem caused by excessive heat gain or loss. In this chapter, system design and the calculation of a system's frictional Structural Concrete Tee Sections. Fitting in the Ductwork. Section 2 – Duct Design Criteria. Boot Diffuser / Takeoff Duct. Speaker / Conduit. Header Duct. source of information for design engineers. How to Use the Duct System Design Notebook. A.6.1 Installation of Single-Wall Duct and Fittings . Duct Fitting Database. A duct fitting database, developed by ASHRAE , which includes 228 round and rectangular fittings with the provision to include flat oval