What is the purpose of an S-shaped duct in HVAC systems?

The purpose of an S-shaped duct in HVAC systems is primarily to change the direction of airflow. This type of duct allows for a smooth transition between different sections of a duct system without causing significant turbulence, which can occur with abrupt changes in direction. The S-shape facilitates a gradual bend, helping maintain efficient air distribution while minimizing pressure loss and noise.

By designing ducts in this manner, engineers can effectively route air around obstacles, through ceilings, or in tight spaces, all while preserving the desired flow characteristics of the HVAC system. This is crucial in ensuring that conditioned air reaches various compartments or rooms efficiently.

Options related to improving air quality, creating a larger airflow area, or increasing system pressure do not accurately represent the specific function of S-shaped ducts. While these factors are important in HVAC design, they are not the direct purpose of S-shaped ducts, which are primarily concerned with directing airflow smoothly through the system.