What is the definition of mechanical ventilation?

Mechanical ventilation refers to the process of introducing and circulating outside air into a building through mechanical means, such as fans and ducts, thereby allowing for precise control over ventilation rates. This control enables the adjustment of air changes per hour (ACH), which is critical for maintaining indoor air quality, comfort, and energy efficiency. By utilizing mechanical systems, one can systematically regulate the volume of fresh air brought into a space and manage exhaust air, which is particularly important in tightly sealed buildings.

The ability to manage air changes is essential for various reasons, including reducing indoor pollutants, humidity control, and ensuring adequate oxygen levels, which cannot be effectively achieved through natural methods alone.