What is hazardous in the Ventilation?

• A. Mechanical Ventilation
• B. Natural Ventilation
• C. Mixed Ventilation
• D. None

Answer: (A)

Ventilation is about moving air to keep the space safe, but the way air is moved matters. Mechanical ventilation uses powered fans and ducts to push or pull air through compartments. That strong, active air movement can spread hazardous atmospheres—smoke, toxic gases, or heat—from one area to another, especially during a fire or contamination event. It can also create pressure differences that force smoke and flames into spaces that might otherwise be safer, complicating evacuation and firefighting. Additionally, the equipment itself introduces risks: moving parts, electrical hazards, and potential failures that can worsen the situation if the system isn’t properly maintained or controlled. For these reasons, mechanical ventilation is the most hazardous option in a ventilation scenario.