What is the difference in temperature that can exist between zones 2 and 3 feet off the floor?

The difference in temperature that can exist between zones 2 and 3 feet off the floor is significant due to the dynamics of thermal layering in a fire environment. As fire dynamics dictate, heat rises, creating stratification in smoke and hot gases. At 2 feet off the floor, air can still be relatively cooler and can be impacted by factors such as ventilation and thermal barriers, while at 3 feet, the temperature may be much higher due to the accumulation of heat and gases moving upwards.

The choice of 200 degrees reflects the potential for a very steep temperature gradient in a structure where a fire is present. The difference is often influenced by several factors including the nature of the materials burning, the rate of fire growth, and ventilation conditions. Consequently, this substantial temperature difference emphasizes the importance of tactical movements and decision-making in fire scenarios, especially in terms of personnel safety and operational strategies.

Understanding this temperature dynamic helps fire officers to evaluate conditions thoroughly when conducting interior operations, ensuring firefighter safety and effective fire suppression efforts.