What type of ventilation utilizes fans and blowers?

The correct choice highlights that mechanical ventilation utilizes fans and blowers to transport air. This method is essential for controlling the internal environment of a building, especially during scenarios involving smoke, heat, or airborne contaminants, such as in a fire situation. Mechanical ventilation systems actively move air in and out of spaces, improving air quality and aiding in fire suppression efforts by removing smoke and harmful gases.

While other types of ventilation exist, they do not involve the use of powered devices in the same way. For instance, natural ventilation relies on passive atmospheric forces, such as wind and temperature differences, to facilitate air movement without mechanical assistance. Vertical ventilation typically concerns the strategic removal of smoke and heat from upper areas of a structure, but it does not involve the use of fans or blowers. Hydraulic ventilation utilizes water to create a fan-like effect to remove smoke but is not classified as mechanical ventilation. Understanding these distinctions is crucial for applying the right ventilation strategies during firefighting operations.