Asbestos Contractor/Supervisor Practice Exam

When setting up a negative pressure enclosure, what areas are typically covered first with polyethylene?

1. Windows

2. Doors

3. Ventilation ducts

4. Walls

The correct answer is: Windows

In the context of setting up a negative pressure enclosure for asbestos abatement, the primary focus is on ensuring containment and preventing the spread of airborne asbestos fibers. The correct initial step involves covering the windows with polyethylene to seal off ventilation pathways that could allow contaminated air to escape into the surrounding environment. By first addressing windows, workers create a critical barrier, minimizing potential leak points as the enclosure is constructed. Following the coverage of windows, the next areas may include doors and walls to further enhance containment. However, addressing windows first is essential as they are often the most direct points of exposure to outside air. Sealing windows effectively contributes to establishing the required negative pressure environment for the safety of both workers and the surrounding area during the abatement process.