What is the term for air being removed from a space and directly conveyed to the atmosphere?

The term for air being removed from a space and directly conveyed to the atmosphere is "Exhaust air." This refers to the process by which air is actively vented out of a building or a specific area, often through mechanical systems such as exhaust fans or vents. This removal is essential for maintaining indoor air quality, controlling odors, and managing humidity levels by eliminating stale air and allowing fresh air to enter.

In contrast, outdoor air is the fresh air that comes from outside into a space, supply air is the air delivered into a space to provide heating or cooling, and renewal air typically refers to air brought into a building to replace exhausted air, ensuring a constant flow of fresh air. Each of these terms has a distinct function in ventilation systems, underscoring the necessity of understanding exhaust air as key to effective air management in mechanical systems.