@FireOnNoiseApp 23 May 2021 more from that month

WHAT IS "BACK DRAFT"? This is a topic that can occur at times of danger around us. There is one interesting fire phenomenon, what is it? "Backdraft" can occur when a compartment is poorly ventilated. When a fire occurs from flammable gases or vapors, the flame grows very slowly due to a lack of oxygen. Remember in the theory of the fire triangle, fire needs 3 components, one of which is oxygen (air). If the smoke or vapor / gas particulate has not been burned out and the room temperature is still above its self-ignition temperature, any time oxygen enters the closed compartment (for example a broken window, a door that is suddenly opened), the ignition will repeat, often in a short time causes the unburned vapor / gas to expand rapidly due to a sudden rise in temperature. The characteristics of the potential presence of backdraft are brownish or yellowish smoke, usually found in between door / window frames, also (glass) windows tend to be brownish / blackish when viewed from the outside. This darker color is due to the smoke particulates floating in the air in the room undergoing incomplete combustion (lack of oxygen). Another characteristic of the window glass when it is held will feel light vibrations due to changes in air pressure in the compartment space. So if you see the compartment as if it is breathing, smoke can appear and be pulled back into the compartment from the door / window gap, immediately EVACUATE it and forbid the public to look closely, because that is a sign there is a backdraft event Backdrafts are a dangerous phenomenon, even for an experienced firefighter. Therefore, the layman should not approach the burning compartment. Backdraft flames can be life-threatening. One way to reduce the risk of backdrafting is to open the roof of the building / compartment so that heat and smoke can penetrate the top, without ignition. Hope this is useful. #Club1Bch