What component is utilized to connect ductwork to an HVAC unit while accommodating movement?

The correct choice is flex connectors, which are specifically designed for connecting ductwork to an HVAC unit while allowing for movement. These connectors typically consist of a flexible material that can absorb vibrations and accommodate thermal expansion or contraction. This flexibility helps to prevent damage to both the ductwork and the HVAC unit by allowing for slight movements caused by changes in temperature or vibrations from the operation of the system.

In contrast, turning vanes are used within ductwork to help direct airflow efficiently when the duct changes direction, but they do not serve the purpose of connecting ducts to HVAC units. Dampers are devices that control airflow within the duct system, allowing for the regulation of air distribution, but they also do not function to connect ductwork to the units while accommodating movement. Isolators are typically used to reduce noise and vibration transmission from mechanical equipment, but they are not utilized for connecting ductwork to HVAC systems.

Consequently, the function of flex connectors in absorbing movement and reducing stress on connections makes them the appropriate choice for this application in HVAC systems.