When directing an elevated stream near a ventilation hole, what is an important consideration?

Projecting water above the horizontal plane when directing an elevated stream near a ventilation hole is crucial for several reasons. When water is aimed above the horizontal plane, it allows for better penetration of the heat radiating from the fire through the ventilation hole. This strategy helps to create a more effective cooling effect, as the water can effectively reach the upper layers of heat and smoke before it descends.

Additionally, angling the stream upwards helps to prevent the attempt at pushing the fire down into other areas, which can occur if the stream is aimed directly into the vent. By creating a cloud of mist or steam rather than a direct forceful stream into the hole, firefighters can more safely influence the fire's behavior.

This approach also facilitates enhanced visibility for firefighters working inside the structure since the steam created can help reduce the heat and potentially the fire's intensity, improving conditions for rescues and further operations. Overall, using an elevated stream and aiming it above the horizontal plane allows for an effective and strategic engagement with the fire near ventilation points.