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Fire Spread

code n-кодекс, свод законов

confined a - ограниченный

embers pl. - горячая зола

roof n - крыша

warp v - деформировать

In room fires the fire travels through the motion of smoke, hot air, heated gases and flying embers. When confined, heat moves in predictable patterns. The fire produces gases that, being lighter then air, rise toward the top of the building. Heated air also rises, as does the smoke produced by combustion. Cool air takes their place and is heated in turn and also rises. As the hot air and gases rise away from the fire, they begin to cool: as they do, they drop down to be reheated and rise again. Within a building, this cycle will first fill the upper parts and then work down toward the fire. Modern codes aimed at limiting fire spread by this cycle require the building of more than three stories to be of fire resistant constructions.

Fire can also travel down, as well as in other directions, depending on the building design and features in the fire area. This type of fire spread can also be dangerous to fire fighters. Certain types of structures have steel building and roof supports that are completely open to fire. Heat spreading through these supports raises their temperature and can cause them to warp and fail, possibly causing the walls and roof to collapse.

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