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Smoke exhaust ductwork, in Europe, is typically protected via passive fire protection means, subject to fire testing (typically to (NBN EN 1366-8 )) and listing and approval use and compliance. It is used to remove smoke from buildings, ships or offshore structures to enable emergency evacuation as well as improved firefighting. In North America, fireproofed ductwork may be used for the purpose of smoke exhaust, but it is more common to use unfireproofed return air ductwork, whereby no fire testing or listings are employed to qualify the ductwork for this use. Evidence of this North American practice can be found in the 2010 National Building Code of Canada, 3.2.8.8. Mechanical Exhaust System, as well as Sections 909.16.2 and 910 of the 2015 International Building Code. ==Means of construction== Similar to pressurisation ductwork, smoke exhaust can be built using: *ordinary sheet metal with external fireproofing treatment; or *a proprietary duct that is inherently fire-resistant; or *suitably stiff fireproofing materials, such as calcium silicate. The primary difference between pressurisation and smoke exhaust ducting is that one pressurises an area, while the other reduces the pressure through exhausting smoke. Some smoke exhaust ductwork requires no fireproofing if the smoke is not expected to be at elevated temperature. 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「Smoke exhaust ductwork」の詳細全文を読む スポンサード リンク
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