What gauge material is required for round metal ducts serving a single dwelling?

The correct gauge for round metal ducts serving a single dwelling is 26 gauge. This choice aligns with the industry standards for residential ductwork. The use of 26 gauge material provides a balance of strength and weight, ensuring that the ducts can effectively handle the airflow while being manageable in terms of installation.

In residential applications, ductwork must also maintain structural integrity and provide adequate insulation while minimizing heat loss. A 26 gauge material is often adequate in terms of durability for the relatively low-pressure systems typically found in single dwelling units. It is also common enough that it ensures compatibility with various fittings and connections used in residential HVAC systems.

Other gauges such as 20, 22, and 30 gauges do not meet the established requirements for residential ductwork as effectively. While lighter gauges may be less expensive and easier to handle, they can be prone to damage or deformation, which can lead to airflow issues and decreased system efficiency.