What term describes air moved from one indoor space to another?

The term that describes air moved from one indoor space to another is "Transfer air." This refers specifically to the movement of air within a building, typically to balance temperature, improve comfort, or promote better overall indoor air quality. Transfer air may not necessarily go through a mechanical ventilation system; instead, it can flow between rooms via doors, vents, or other openings.

In contrast, exhaust air refers to air that is being removed from a space to maintain a certain atmosphere or remove contaminants, while supply air is air delivered into a space from a heating or cooling system. Makeup air, on the other hand, is the fresh air brought into a building to replace the air that has been exhausted, ensuring adequate ventilation. Understanding these distinctions is crucial for effective HVAC design and operation.