Ventilation in firefighting, means the tactic of creating an opening in a direction above or opposite to the entry point so that smoke and heat will be released, helping the firefighters. If proper…
Ventilation in firefighting, means the tactic of creating an opening in a direction above or opposite to the entry point so that smoke and heat will be released, helping the firefighters. If proper ventilation is not provided to the fire it becomes much harder to fight. It may also lead to a explosion due to the increase in the quantity of smoke. A poorly placed or ill timed ventilation may also increase the air supply making it grow and spread.
Existing openings such as windows, skylights can be used for ventilation. Fans can also provide ventilation and so can scuttles on the roof. Using the equipments such as a saw a hole can be made in the roof to provide necessary ventilation. A hose-stream through the hole in the roof also helps to create pressure in the room leading to ventilation called hydraulic ventilation. The designs of modern buildings is done so as to provide automatic ventilation through the stairways and elevator shafts. When due to internal pressure and heat the glass windows break or the fire burns the roof, the building is said to have self ventilated.
A firefighter has to make an important decision in the form of whether to ventilate or not?
It has been accepted in some countries that breaking up the building is the best option tohelp evacuate the occupants and also prevent horizontal spreading of the fire. Some of the other countries in general however prefer not to ventilate so as not to provide the fire with additional air which makes the fire grow. For providing ventilation in case of fire it is necessary to know about how the fire acts in different circumstances. Hence it is neccessary for the firefighter to be in full knowledge of the situation before undertaking any venting operations. Such a case makes it imminent for a firefighter to know how the gases form, flow and burn and what impact a venting operation will have in that particular situation. It is important to assess which venting operation will be safer or provide a safer and useful option. Fire fighters should also have a perfect understanding of pressure build-up in a building and the flow of gases out of the building through different opening under various circumstances.