How long can flexible air connectors be limited in length?

Flexible air connectors, often used for ductwork in HVAC systems, are subject to specific length limitations to ensure optimal airflow and reduce resistance. In North Carolina Mechanical Code, the maximum allowable length for flexible air connectors is established at 14 feet. This limit is important because longer connectors can lead to increased pressure drops, which can negatively affect the performance and efficiency of the heating, ventilation, and air conditioning systems. Maintaining the recommended length ensures that the air delivered through the system remains within design specifications, thus allowing for proper air distribution and system functionality. Therefore, the choice of 14 feet fits within the code requirements for these connectors.