What type of ventilation uses positive pressure to remove smoke and heat?

Forced ventilation employs positive pressure to effectively remove smoke and heat from a structure. This technique relies on mechanical systems, such as fans or blowers, to push air and create a pressure differential that drives smoke and heat out of the space. By using this method, fire investigators can aid in firefighting efforts, improving visibility and reducing heat levels within the building.

Natural ventilation, in contrast, utilizes the natural movement of air through openings like windows and doors without any mechanical assistance. Horizontal ventilation involves directing smoke out of a structure at the same level, typically through windows or doors. Vertical ventilation, on the other hand, entails removing smoke and heat through openings in the upper parts of the structure, such as roofs, primarily relying on the natural tendency of hot air to rise. Each of these methods has its specific applications and advantages, but they do not utilize the positive pressure method characteristic of forced ventilation.