What can be the speed of hot gases during flashover under no wind conditions?

During a flashover event, the speed of hot gases can reach significant velocities due to the rapid increase in temperature and the dynamics of gases expanding as they are heated. Under no wind conditions, the movement of these gases can be influenced by the convection processes occurring in the fire environment.

The range of 12-20 mph is a realistic representation of the speeds that hot gases can attain during a flashover. This speed is a product of the intense heat generated by the flames, creating upward movement of the hot gases, which in turn pulls in cooler air at lower levels, enhancing the fire's growth. Proper understanding of these speeds is crucial for firefighters as it helps them assess fire dynamics and make safe decisions during fire suppression efforts. Knowing that these gases can travel at such speeds highlights the immediate dangers present in fire situations and underscores the importance of rapid response and situational awareness.