This book provides a complete Fire Fighter I and Fire Fighter II training solution. The Fourth Edition features the same exceptional content, along with the latest standards, technology, and research, including the latest research-based data from Underwriters Laboratories (UL) and the National Institute of Standards and Technology (NIST). Understanding that today's fires release energy faster, reach flashover potential sooner, and may reach higher temperatures than building fires of the past is critically important for new and seasoned fire fighters. This foundational knowledge is covered extensively, in addition to recent data identifying the higher rate of physical and mental health issues in the fire service than the general population. Information relating to fire fighter health and safety has been revised and updated to include behavioral and physical health awareness topics and statistics.