What is the required minimum thickness of metal for a vent connector used with a low-heat appliance having a diameter of 14 inches?

The minimum thickness of metal for a vent connector used with a low-heat appliance having a diameter of 14 inches is indeed 20 gauge. According to the North Carolina Mechanical Code, vent connectors for low-heat appliances (which typically include appliances that do not exceed certain temperature thresholds) must follow specific gauge requirements based on their diameter.

For a 14-inch diameter vent connector, the use of 20 gauge metal is specified to ensure proper strength and temperature resistance while maintaining airflow efficiency. Using a gauge that is too thin could compromise the structural integrity of the connector, potentially leading to deformation or failure under regular operating conditions.

The 20 gauge thickness is determined to be adequate for the application, balancing durability and performance without being excessively heavy or cumbersome. This helps in installation and guarantees that the system functions efficiently and safely.