What diameter duct is required to deliver 2000 CFM at 0.05" friction loss?

To determine the appropriate diameter of duct required to deliver 2000 CFM (Cubic Feet per Minute) with a friction loss of 0.05 inches, it is essential to reference established HVAC duct design tables or charts that correlate duct diameter, airflow, and friction loss.

Using such a chart will show that for a system aiming to deliver 2000 CFM at a friction loss of 0.05 inches, a duct diameter of 20 inches is suitable. This diameter has been calculated based on the ideal balance between airflow resistance and required air volume, ensuring efficient air delivery without excessive energy loss or noise caused by turbulence within the duct.

A larger diameter duct, such as 22 inches or 24 inches, would not be necessary for this airflow requirement and could lead to increased material costs and installation difficulties without providing tangible benefits for the specific CFM and friction loss desired. Similarly, an 18-inch duct would be insufficient to handle the required volume of air, resulting in inadequate airflow and potential system performance issues.

Thus, the choice of a 20-inch diameter duct effectively meets the specified parameters while maintaining optimal system efficiency.