How is a negative pressure system defined?

A negative pressure system is characterized by static air pressure being lower inside a space compared to the outside environment. This definition is crucial in controlling the movement of airborne contaminants, especially in environments where asbestos work is conducted. By maintaining a lower pressure inside, any potential airborne toxins or fibers are effectively prevented from escaping into the surrounding area, helping to protect workers and minimize contamination risks.

In negative pressure systems, the differential creates a flow of air from outside into the workspace, ensuring that any potentially hazardous materials are contained within the area designed for the work. This principle is vital not only for compliance with safety regulations but also for ensuring the health and safety of workers and the surrounding community.

Other options do not align with the definition of a negative pressure system. In instances where static air pressure is higher or equal to the outside, there is a risk of contaminants escaping or entering the workspace, which negates the protective measures necessary in asbestos handling. Fluctuating pressures can also lead to instability and pose hazards, unlike a consistent negative pressure system, which provides a controlled environment that is essential for safely managing asbestos work.