Which protective action is NOT recommended during in-place protection?

• A. closing all windows
• B. closing all doors
• C. monitoring local TV and radio stations
• D. ensuring HVAC system remains operating

Answer: (D)

In-place protection is a strategy used during hazardous material incidents when evacuation may not be feasible or safe. It involves taking steps to minimize exposure to contaminants while remaining indoors.

The recommended protective actions typically include closing all windows and doors to limit infiltration of hazardous materials into the building. Monitoring local TV and radio stations is also advised to stay informed about the situation and receive further instructions from officials, which can be critical during such emergencies.

However, ensuring that the HVAC (Heating, Ventilation, and Air Conditioning) system remains operating is not advisable during in-place protection. Activating the HVAC system could potentially draw outside contaminated air into the building, increasing the risk of exposure to hazardous materials. This is why maintaining the operation of HVAC systems in such situations is considered an inappropriate protective action. Instead, it’s recommended to shut down the HVAC system to prevent outside air from entering, thereby enhancing the building's protective barriers.