| 摘要 |
A duct system contains a narrow, liquid tight conduit filled with cold water which can be used to prevent fires in the ducts of chimneys, high rise buildings, restaurants and the like. If a fire starts in a duct, the wall of the duct heats up very slowly because of its proximity to the thin walled conduit containing the cold water (which gets warmer as the fire builds momentum). If the fire persists and the heat of the outer wall rises to a designated temperature (e.g. 200 degrees Fahrenheit), a valve opens and the heated water (the originally cold water) is flushed out and fresh cold water is brought in, further impeding the fire's progress. The fire will likely burn itself out without ever igniting any combustibles outside the duct walls. The flushed out water can be sprayed onto the roof of the building to prevent any burning fly ash from starting a fire on the roof.
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