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Heat and Smoke Vents are installed in buildings as an active fire protection measure. They are openings in the roof which are intended to vent the heat and smoke developed by a fire inside the building by the action of buoyancy, such that they are known as "gravity vents". ==Regulatory requirements== Heat and smoke vents are typically installed in buildings for the following reasons: * Storage occupancies - The heat release rate from high piled storage commodities is expected to be very high. In such cases, it is considered by some fire protection professionals desirable to vent the heat from the building if the temperatures in the building reaches sufficiently high levels to endanger the structural stability of the roof system. Smoke venting is also considered to provide a minor benefit to increase the visibility in the interior space to facilitate manual fire fighting efforts for a limited period of time. The use of vents in sprinklered buildings has been controversial over the last 25 years. Vent technology and sprinkler technology were developed independently of one another. Their interaction as beneficial technologies working together has not been successfully demonstrated. Many fire protection professionals are concerned that vents may cause sprinkler systems to fail to control a fire. * Large internal volume spaces – Venting smoke from large spaces which regularly contain large numbers of people, such as malls and atria.〔NFPA 92B Standard for Smoke Management Systems in Malls, Atria, and Large Spaces 2005 Edition〕〔NFPA 101 Life Safety Code 2006 Edition A.36.4.4.2.2(6)〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Heat and smoke vent」の詳細全文を読む スポンサード リンク
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