Reading Smoke "Flashover Simulators" Flashover simulators are an excellent way to train firefighters in safe, yet realistic conditions. It provides a controlled environment where firefighters can learn and recognize all indicators associated with flashover! If you have the opportunity to take a class, training, or drill in one never turn it down! FFPG Drill Question?: What fire phenomenon proceeds flashover and can be hidden in smoke above our heads while operating? | Firefighter Proving Grounds