In building design, what does positive pressure typically help to prevent?

Positive pressure in building design is primarily used to help prevent air infiltration. When a building is maintained at a higher internal pressure compared to the outside, it encourages air to flow out of the building rather than being drawn in from the exterior. This is particularly important in maintaining indoor air quality and controlling the entry of outside contaminants, pollutants, and allergens. By ensuring that air is expelled rather than drawn in, positive pressure helps to keep unwanted elements outside, thus contributing to a healthier indoor environment.

It's also worth noting that while positive pressure can indirectly influence airflow restrictions, humidity, and temperature stability, its most direct impact is on preventing air infiltration specifically. This makes it a crucial strategy in building design, particularly in environments where air quality is essential.