The book is primarily intended for the training activities of the Swedish Rescue Services Agency. Chapters 1-4 include theoretical concepts of fi re ventilation, the fundamental principles for fire gases, pressure and temperature conditions in buildings. The book also describes how fire ventilation ought to be implemented in practice, which problems and opportunities can be expected when creating openings in different types of structures, and the essentials of positive pressure ventilation (chapters 5-8). In chapter 9 there is a general reasoning on tactics during fire ventilation. The final chapter in the book presents examples of fire fighting situations.