Which statement about NPE is correct?

Which statement about NPE is correct?

• A. Neutral Pressure Environment
• B. Negative Pressure Enclosure
• C. No Pressure Exemption
• D. Non-Penetrating Envelope

Answer: (B)

Negative pressure enclosure means a defined containment area where the air inside is kept at a lower pressure than the surrounding spaces. This setup makes air flow into the enclosure rather than out, so asbestos fibers stay contained even if there are small leaks. In practice, the enclosure is formed with plastic barriers, uses a dedicated exhaust system with HEPA filtration, and is monitored with a differential pressure check to ensure the negative pressure is maintained during work. This combination of physical containment and controlled airflow is what prevents fibers from escaping into the surrounding environment. The other terms don’t describe this containment approach. A neutral pressure environment wouldn’t create inward air flow to keep fibers from escaping. The phrases about no pressure exemption or a non-penetrating envelope don’t capture the active pressure control that's central to containing asbestos fibers.

Negative pressure enclosure means a defined containment area where the air inside is kept at a lower pressure than the surrounding spaces. This setup makes air flow into the enclosure rather than out, so asbestos fibers stay contained even if there are small leaks. In practice, the enclosure is formed with plastic barriers, uses a dedicated exhaust system with HEPA filtration, and is monitored with a differential pressure check to ensure the negative pressure is maintained during work. This combination of physical containment and controlled airflow is what prevents fibers from escaping into the surrounding environment.

The other terms don’t describe this containment approach. A neutral pressure environment wouldn’t create inward air flow to keep fibers from escaping. The phrases about no pressure exemption or a non-penetrating envelope don’t capture the active pressure control that's central to containing asbestos fibers.