When sheltering people in place, the citizens should be directed to

When sheltering people in place, the citizens should be directed to

• A. Close all heating, ventilation, and air conditioning systems
• B. Open windows for air exchange
• C. Keep all heating, ventilation, and air conditioning systems running
• D. Seal doors and turn off fans

Answer: (A)

Sheltering in place aims to minimize your exposure by stopping outside air from entering and preventing contaminants from circulating inside. The heating, ventilation, and air conditioning system can pull outdoor air into the building and push air through ducts, which can spread any contaminant. If the system stays on, contaminated air can be drawn in and circulated to other rooms. Opening windows would let in outdoor air and worsen the situation, while keeping the system running keeps air moving and can spread pollutants. Turning the HVAC off stops new outdoor air from entering and reduces internal air movement, significantly lowering exposure risk. After shutting it down, also close doors, seal gaps, and stay tuned to official guidance.

Sheltering in place aims to minimize your exposure by stopping outside air from entering and preventing contaminants from circulating inside. The heating, ventilation, and air conditioning system can pull outdoor air into the building and push air through ducts, which can spread any contaminant. If the system stays on, contaminated air can be drawn in and circulated to other rooms. Opening windows would let in outdoor air and worsen the situation, while keeping the system running keeps air moving and can spread pollutants. Turning the HVAC off stops new outdoor air from entering and reduces internal air movement, significantly lowering exposure risk. After shutting it down, also close doors, seal gaps, and stay tuned to official guidance.