During in-place protection, which action is NOT a protective measure?

• A. Sealing doors and windows
• B. Stopping ventilation if advised
• C. Monitoring air quality
• D. Ensuring HVAC system remains operating

Answer: (D)

In-place protection aims to isolate the area and minimize exposure by controlling air flow and entry points. Sealing doors and windows creates a physical barrier that helps keep contaminants from spreading into adjacent spaces. Stopping ventilation if advised prevents drawing contaminated air into other areas and reduces the driving force that could carry the hazard through the building. Monitoring air quality provides real-time information about the atmosphere, so you know when it’s safe to stay sheltered or to leave.

Keeping the HVAC system running would keep air moving through the building, which can spread contaminants beyond the protected area and undermine containment. That’s why maintaining the HVAC in operation is not a protective measure in this context.