What is septum stack?

As an AI language model, I do not have access to the context or specific field of study for "septum stack." However, a septum stack used in HVAC systems could refer to a series of partition walls within a duct that improves air quality by separating clean air from contaminated air or by regulating air pressure and temperature for better energy efficiency. A septum stack typically consists of layers of insulation and metal sheets that create labyrinth-like channels to direct airflow. These ducts are commonly used in commercial and industrial buildings, particularly in areas where contamination control is essential, such as laboratories, hospitals, and clean rooms.