What is the maximum vertical support spacing for flexible ducting?

The maximum vertical support spacing for flexible ducting is established to ensure that the duct remains properly supported and does not sag excessively under its own weight, which can lead to airflow restrictions and potential damage over time. The code typically specifies a maximum spacing of 6 feet between supports for flexible ducting. This distance helps maintain the structural integrity of the duct system, promotes efficient airflow, and prevents stress on the duct material, which can lead to disconnections or leaks. Proper support also aids in compliance with building and HVAC codes, ensuring a safe and effective installation. Therefore, 6 feet is the correct answer as it aligns with the industry standards for flexible ducting support.