How does flexible ductwork compare to rigid ductwork in terms of friction loss?

Flexible ductwork typically has less friction loss compared to rigid ductwork. This characteristic can be attributed to its construction and the way air flows within the system. Flexible ducts are made of a softer material that can adapt to various configurations and pathways, allowing for fewer sharp bends and turns. This adaptability can help create smoother airflow, resulting in reduced friction as the air moves through the duct.

On the other hand, rigid ductwork, while often more durable and capable of maintaining airflow over longer distances without sagging, generally has higher friction losses due to its straight edges and junction points. Sharp corners or transitions in rigid systems can create turbulence, increasing resistance to airflow and thereby raising friction losses.

Understanding how different types of ductwork affect airflow and friction loss is essential for HVAC design, as it can impact system efficiency, air distribution, and overall performance.