Abstract: A method and apparatus for training firefighters. The apparatus is uniquely designed to realistically simulate both the precursor indications of the flashover phenomena as well as flashover phenomenon itself. Because the trainees are positioned within the apparatus, the first hand training method of the invention teaches the trainee, not only how to recognize the warning signs of flashovers, but also teaches the trainee what follows these warning signs and what to do if confronted with the warning signs. The training apparatus of the invention is of a simple but durable construction which provides a high degree of safety to the trainees and is one which can be provided to fire departments at relatively low cost.