What does building pressure diagnostic testing compare?

Building pressure diagnostic testing primarily focuses on understanding how air pressure is distributed within a building compared to the outside atmosphere. This method typically assesses how the overall pressure in the building interacts with the external environment.

When conducting this type of diagnostic testing, technicians measure the ambient pressure inside the building to determine if it is greater or less than the pressure outside. This comparison can reveal critical issues regarding air leaks, insulation effectiveness, and the overall tightness of the building envelope. By identifying pressure differentials, professionals can make informed decisions about potential air sealing or ventilation improvements, thereby enhancing energy efficiency and indoor air quality.

In contrast, the other options focus on specific types of pressure measurements, either within isolated spaces or related to mechanical systems, which do not directly address how the entire building's pressure interacts with the outside air.