What is a disadvantage of using vertical ventilation?

Using vertical ventilation can increase the risk of fire spread because it creates openings in the roof or upper areas of a structure, which can allow heat, smoke, and flames to escape. This sudden release of these elements can potentially draw fresh air into the structure, leading to the phenomenon known as "flashover," where fire spreads rapidly. Additionally, if the venting is not properly controlled, it can cause fire to spread to areas that might not have been previously affected.

In certain scenarios, the increase in air flow can cause a fire to intensify and spread to other parts of the building or even to adjacent structures. This potential for increased fire behavior is a significant consideration when deciding to use vertical ventilation on scene.