Which of the following is NOT a form of ventilation?

• A. Natural ventilation
• B. Mechanical ventilation
• C. Air conditioning ventilation
• D. Local exhaust ventilation

Answer: (C)

Ventilation is about moving air to dilute or remove contaminants and bring in fresh air. Natural ventilation uses openings and environmental forces to achieve air exchange. Mechanical ventilation uses fans and ducts to supply and exhaust air. Local exhaust ventilation captures contaminants at their source and removes them before they spread.

Air conditioning is primarily about controlling temperature and humidity, and it often relies on recirculating air rather than exchanging it. While an HVAC system may include some air exchange, its main purpose is environmental conditioning, not ventilation. Therefore, it’s not considered a form of ventilation.