What is the definition of air removed from a conditioned space and intended for reuse as supply air?

The correct answer is recirculated air. This term specifically refers to the air that is removed from a conditioned space and intended to be reused as supply air. In HVAC terminology, recirculated air is a significant concept because it helps in maintaining indoor air quality and energy efficiency.

When air is recirculated, it can be filtered, reconditioned, and mixed with fresh air before being supplied back to the environment. This process is essential in commercial applications where controlling temperature, humidity, and air quality is crucial for occupant comfort and operational efficiency.

Exhaust air refers to air that is expelled from a space and is not designed for reuse. Fresh air is the clean air brought into the space, typically from outside, to ensure that the environment remains healthy. Return air is the air that is taken from the conditioned space back into the HVAC system but does not encompass the intention of reuse in the same manner as recirculated air does. Understanding these distinctions is important for mechanical inspectors in evaluating HVAC systems effectively.