Most modern building codes define a high-rise structure as a building greater than 75 feet in height from the lowest level of fire department vehicle access to the highest occupiable floor. When fires occur in high-rise structures, the responding firefighters are faced with many challenges. Because of the unique aspects of high-rise buildings, routine fire tactics, including ventilation, can become very difficult. Responding fire personnel must be familiar with fixed smoke management systems as well as options for positive-pressure ventilation (PPV) to ensure the safety and effectiveness of fireground operations.