When fires occur in confined spaces with little ventilation, there can be a risk of a hazardous “backdraught” situation. Signs of a potential backdraught however can be observed very quickly. In a real situation, flammable gasses accumulate in the room and create excess pressure that forces smoke outside. This causes a momentary vacuum that in turn sucks the smoke in once again along with some oxygen to continue the cycle. Thus a “puffing” effect around the door and a hot door handle can indicate to firemen that a backdraught risk exists.
HAAGEN’s Backdraught-Indicator™ provides trainees with a realistic yet completely safe simulation of all the key signals that indicate this potentially hazardous situation.