Why is it important to shut down HVAC systems during a shelter-in-place?

• A. To facilitate emergency communication
• B. To improve air quality
• C. To reduce exposure to contaminants
• D. To maintain temperature control

Answer: (C)

Shutting down HVAC systems during a shelter-in-place is crucial for reducing exposure to contaminants in the air. When there is a hazardous incident, harmful substances may be released into the environment. HVAC systems can draw in outside air, which may contain these contaminants, and circulate them throughout a building. By disabling these systems, the indoor air becomes more isolated from outside pollutants, minimizing the risk of inhalation or exposure for individuals inside the structure. This action is a vital step in ensuring the safety and health of occupants during an emergency situation, as it helps to create a barrier between hazardous materials in the environment and the indoor air quality.