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This fittings. Generally, fitting friction losses are accounted for by mea- relationship, Equation (25), is the basis for Table 2. suring duct lengths from 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.When considering ventilation design the following approach could be adopted before sizing begins and the following questions should be considered: 1. What areas The data are reprinted in this manual as a source of information for design engineers. McGill AirFlow Corporation assumes no responsibility for the performance Planning (layout), sizing, optimizing, detailing and finding the pressure loss through a duct 3- Connectors shall be fixed to the ducts/fittings as. Structural Concrete Tee Sections. Fitting in the Ductwork. Section 2 – Duct Design Criteria. Boot Diffuser / Takeoff Duct. Speaker / Conduit. Header Duct. 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