What is the purpose of a backdraft damper in HVAC systems?

The purpose of a backdraft damper in HVAC systems is primarily to prevent backflow of air. These dampers are installed in ductwork and are designed to close when air is flowing in the reverse direction, effectively blocking any unwanted air from re-entering a space. This is particularly important in systems that rely on balanced airflow, as backflow can lead to loss of heating or cooling, creating discomfort in the environment. By ensuring that air does not flow backwards, backdraft dampers help maintain the efficiency of the HVAC system and preserve the quality of indoor air, preventing issues such as drafts or the infiltration of outside air.

The option related to enhancing airflow efficiency can be indirectly influenced by the operation of a backdraft damper, but its primary function is more about preventing air from moving inappropriately. While managing temperature variations and humidity levels may be important aspects of HVAC systems, they do not specifically pertain to the role of a backdraft damper. The damper's main role is to control airflow direction, making it a key component in maintaining system integrity and performance.