What connects the air handler to the ductwork on the supply side?

The connection between the air handler and the ductwork on the supply side is achieved through a plenum. A plenum serves as a central hub that distributes the conditioned air from the air handler into the supply ducts. It manages air flow and pressure, ensuring that the air is effectively directed to various parts of the building or space where heating or cooling is needed.

Using a plenum also allows for better organization and flexibility in the duct system, as it can accommodate multiple supply ducts branching off from a single point. Additionally, plenums help minimize noise and airflow resistance, contributing to an overall more efficient HVAC system. In contrast, a diffuser tends to be used at the termination point of ductwork rather than where it connects, while filters are used to clean the air before it reaches the ducts, and a Venturi is a device used to measure fluid flow, not typically involved in ductwork connections.