The radius of a flexible duct bend should not be less than which measurement?

The radius of a flexible duct bend is critical for maintaining proper airflow and minimizing resistance. The correct answer indicates that the radius should not be less than the diameter of the duct. This standard is essential to ensure that the airflow is not restricted as it navigates the bend in the duct. A radius that is too tight can lead to turbulence and increased friction loss, which can diminish the efficiency of the entire air distribution system.

When the bend radius is at least equal to the diameter of the duct, it allows for smoother airflow, reducing the risk of pressure drops and maintaining system efficiency. This practice is especially important in heating, ventilation, and air conditioning (HVAC) systems where optimal performance is crucial for comfort and energy efficiency.