What is the maximum sag allowed for flexible duct between supports?

The maximum sag allowed for flexible duct between supports is determined by industry standards to ensure optimal airflow and performance of the HVAC system. A sag of 1/2 inch is designated as the acceptable limit because any excess sag can lead to restrictions in airflow, increased resistance, and potential damage to the ductwork over time. This standard promotes efficiency by helping to maintain a clear path for air, reducing turbulence, and preventing potential blockages that can arise from excessive bending or drooping of the duct.

In practice, maintaining the proper duct shape is crucial, as it directly affects the overall system's efficiency and functionality. By adhering to this sag limit, technicians help ensure that the airflow remains balanced and that the equipment runs optimally, which is important both for comfort and energy efficiency in building environments.