What is the term for an air compartment that is part of an air distribution system?

The term for an air compartment that is part of an air distribution system is "Plenum." In heating, ventilation, and air conditioning (HVAC) systems, a plenum serves as a central distribution point for conditioned air. It is typically a large, enclosed space where air can flow freely from the heating or cooling system before being distributed into the various ducts that lead to different areas of a building.

The design of a plenum allows for efficient air circulation and helps maintain an even distribution of air throughout the system. In many HVAC setups, the plenum can be found above a ceiling or below the floor, making it integral to the overall function of the air distribution system. Understanding the role of a plenum is essential for those involved in HVAC design and installation, as it directly impacts air quality and system efficiency.

Other terms, while they might relate to HVAC systems, do not refer specifically to an air compartment that functions as the central hub for distributing air. For instance, ventilation shafts are specific pathways designed to carry air to or from different areas, blower chambers relate to where the air is pressurized or moved, and air handlers are the units that condition the air but do not serve as compartments for distribution.