Does flexible ductwork experience more or less friction loss compared to rigid ductwork?

Does flexible ductwork experience more or less friction loss compared to rigid ductwork?

• A. More friction loss
• B. Less friction loss
• C. No difference
• D. Only in short runs

Answer: (B)

Flexible ductwork typically experiences less friction loss compared to rigid ductwork, primarily due to its design and construction. The surface of flexible ducting usually has a smoother inner lining than that of some types of rigid ductwork, which can reduce the turbulence of airflow within the duct. Additionally, flexible ducts can be installed with fewer bends and turns than rigid ducts, further minimizing points where friction can be increased. The design of rigid ductwork can often involve fittings and joints that create additional resistance to airflow, leading to higher friction loss. In applications where the layout allows for flexible ductwork to be used, it can maintain better airflow efficiency over distance compared to a rigid counterpart, making it a practical choice in many residential and light commercial HVAC systems.

Flexible ductwork typically experiences less friction loss compared to rigid ductwork, primarily due to its design and construction. The surface of flexible ducting usually has a smoother inner lining than that of some types of rigid ductwork, which can reduce the turbulence of airflow within the duct. Additionally, flexible ducts can be installed with fewer bends and turns than rigid ducts, further minimizing points where friction can be increased.

The design of rigid ductwork can often involve fittings and joints that create additional resistance to airflow, leading to higher friction loss. In applications where the layout allows for flexible ductwork to be used, it can maintain better airflow efficiency over distance compared to a rigid counterpart, making it a practical choice in many residential and light commercial HVAC systems.