Above the neutral pressure plane, how is the air classified?

The air above the neutral pressure plane is classified as pressurized air. This classification reflects the fact that air located above this level tends to have a higher pressure relative to the surrounding atmosphere. The neutral pressure plane itself is a key concept in understanding how air movement and pressure differentials operate within different sections of a building.

In a typical scenario, air below the neutral pressure plane is often under negative pressure, while the area above it is under positive pressure, meaning that the air is effectively "pressurized." This difference in pressure can greatly influence the movement of radon and other gases within a building, making it essential for radon measurement technicians to comprehend these dynamics.

Understanding the classification of air in relation to the neutral pressure plane allows professionals to make more informed decisions regarding ventilation and remediation strategies for radon control.