For vertical installation, flexible duct must be supported every what distance?

In vertical installations, flexible ductwork must be properly supported to prevent sagging and ensure efficient airflow. The requirement to support the duct every 6 feet is based on building codes and industry standards that aim to maintain the integrity and performance of the duct system over time. If the duct is not supported adequately, it can lead to issues such as bending, kinking, or sagging, which may obstruct airflow and reduce the efficiency of the HVAC system.

Additionally, supporting the duct at this specified distance helps to mitigate noise that can arise from vibrations and prevents damage that could occur from the weight of the duct over spans that are too long without support. Ensuring proper support contributes to durability and optimal operation, which is critical in maintaining comfortable and efficient indoor environments.