What is the airflow rate of a 10" round duct that has a .1 friction loss?

To determine the airflow rate in a duct based on its diameter and friction loss, you can use established duct sizing and airflow tables that relate these values. A round duct's airflow capacity can be calculated or inferred using specific formulas or charts that factor in the duct's size and the pressure loss due to friction.

In the case of a 10" round duct, a .1 friction loss is relatively low, indicating a reasonable airflow rate. Standard charts or calculations show that at this friction loss, the duct can effectively carry around 415 cubic feet per minute (cfm) of air.

This understanding comes from the relationship between duct diameter, airflow rate, and the resistance to airflow created by friction. The friction loss signifies how much energy is lost due to the movement of air against the duct wall, affecting overall efficiency and capacity. The 415 cfm value reflects a balance of these factors, making it a practical choice for the described conditions.

Utilizing these tables or calculations is essential for HVAC professionals when designing or assessing duct systems to ensure they meet the required airflow for comfort and efficiency.