Asbestos Contractor/Supervisor Practice Exam

Where does make-up air for a negative pressure enclosure usually come from?

1. Inside the building

2. Storage rooms

3. Outside the site

4. Sealed, labeled containers or wraps

The correct answer is: Sealed, labeled containers or wraps

Make-up air for a negative pressure enclosure typically comes from sealed, labeled containers or wraps. This method is essential because it ensures that the air introduced into the workspace is free from contaminants and maintains safety standards. Negative pressure enclosures are designed to contain airborne asbestos fibers within a controlled area, and maintaining such pressure relies on carefully managing air supply and quality. Using air from sealed containers helps to prevent the infiltration of unfiltered air from other areas, which might carry asbestos fibers or other airborne pollutants, potentially compromising the integrity of the containment. By relying on this controlled source of make-up air, workers can help protect the safety of both personnel within the enclosure and others in the surrounding environment. In contrast, air from inside the building, storage rooms, or outside the site does not provide the same level of contamination control and could introduce risks associated with exposure to hazardous materials. Thus, the best practice is to utilize sealed sources to maintain the efficacy of negative pressure systems.