How does airflow behave in a building relative to pressure?

Airflow in a building is primarily driven by pressure differences, following the principle that fluids (including air) naturally move from areas of higher pressure to areas of lower pressure. This behavior is grounded in the fundamental laws of physics, specifically the movement of gases and their tendency to equalize pressure differences.

In a building, various factors such as ventilation systems, open windows, and even the natural infiltration or exfiltration of air can create pressure gradients. When areas within the building experience higher pressure due to, for example, active heating, cooling, or mechanical ventilation, the air will seek to move towards areas of lower pressure, such as outdoor spaces or less pressurized zones within the building.

Understanding this behavior is crucial for mold specialists, as it directly influences how moisture-laden air can move within a structure. Elevated humidity levels can contribute to mold growth if that moist air is transported into cooler, less ventilated parts of a building where condensation may occur.

Options that suggest airflow is unaffected by pressure differences or moves from lower to higher pressure do not correctly represent the relationship between air movement and pressure. Similarly, the notion that airflow causes pressure equilibrium oversimplifies the dynamics at play, as it overlooks the external and internal factors that continuously influence air pressure in various