What is the term for the vertical distance that air drops after leaving the outlet?

The term "drop" refers specifically to the vertical distance that air descends after exiting a duct outlet. This concept is crucial in understanding air distribution and flow dynamics in HVAC systems, where efficient airflow is necessary for proper ventilation and temperature control.

In the context of sheet metal and ductwork, having the right terminology is important for precise communication among professionals. Recognizing "drop" as the specific measurement allows for accurate calculations when designing systems that need to account for how air behaves when it leaves the outlet and begins to fill the space below.

Other terms such as "fall," "draft," and "plunge" may relate to air movement and conditions but do not accurately define the vertical distance that air travels after it exits an outlet. Therefore, using "drop" clearly indicates the relevant aspect of airflow dynamics in this context.