Flexible Connections

Table 2-2.—Recommended Gauges for Sheet-Metal Duct Construction and piping systems. These obstructions must be avoided by fabricating the duct system to go around the obstacles. Do NOT run obstructions through duct systems because it creates turbulence that reduces the efficiency of the system. When the obstruction is an electrical obstruction, you should ensure all power is off and safety checked. When running the duct through an obstruction is absolutely unavoidable, the turbulence can be reduced by enclosing the obstruction in a streamlined collar (fig. 2-93). FLEXIBLE CONNECTIONS Figure 2-93.—Easement around an obstruction in ducts. Most duct systems are connected to either a create vibration should be made with heavy canvas, as heating or a cooling system. These systems are shown in figure 2-94. general] y electric motor driven to move air through the duct system. Therefore, all inlet and outlet duct The most common method of making connections connections to all fans or other equipment that may between duct sections and fittings is the method of 2-33