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Ventilation (firefighting)
Ventilation is an important part of structural firefighting tactics, and involves the expulsion of heat and smoke from a fire building, permitting the firefighters to more easily and safely find trapped individuals and attack the fire. If a large fire is not properly ventilated, not only will it be much harder to fight, but it could also build up enough poorly burned smoke to create a smoke explosion, or enough heat to create a flashover. Contrarily, poorly placed or timed ventilation may increase the fire's air supply, causing it to grow and spread rapidly. The flashover may cause the temperature inside the building to peak at over 1000 °C (1850 °F).
==Types of ventilation==
In general, there are two types of ventilation; vertical and horizontal. Their names refer to the general locations of the intended exit points of the heat and smoke to be ventilated. Vertical ventilation takes place through holes cut in the roof, typically by truck companies during the early stages of a fire in a process known collectively as roof operations, while horizontal ventilation usually takes place through doors and windows. The goal of each is to clear heat and smoke to increase chances of survival for trapped occupants, and/or so that water lines can be advanced into the structure, to more effectively battle the flames. While their goals are similar, their applications are different, but still both require good timing and coordination so that increased air flow through a structure doesn't contribute to fire spread.〔(【引用サイトリンク】url=http://www.firerescue1.com/fire-products/ventilation/articles/18506-Ventilation-Basics/ )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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