What does "ghost airflow" refer to in a duct system?

The term "ghost airflow" refers specifically to unwanted air movement within the duct system. This phenomenon can occur due to leaks, poorly sealed connections, or insufficiently insulated ducts, leading to air traveling through areas where it shouldn't. This unintended airflow can reduce the efficiency of the HVAC system, cause temperature fluctuations, and lead to increased energy costs.

Understanding the implications of ghost airflow is crucial for HVAC technicians, as it informs the need for proper sealing and maintenance of duct systems to ensure they only deliver conditioned air as intended. This concept highlights the importance of a well-designed and well-maintained duct system to optimize performance and ensure occupant comfort.