Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pressurisation ductwork is a fire protection system. It is used to supply a steady stream of fresh air to any area of refuge or designated emergency evacuation or egress route. Typically, pressurisation ductwork is subject to demonstrable product certification on the basis of fire testing (for example, ISO 6944). In the United States, additional hose-stream testing is required to achieve product certification, as the system includes not just a section of ductwork tested in a full scale floor furnace, but also a firestop, which must survive the hose. Pressurisation systems are evaluated for exterior fire exposure. Grease ducts, on the other hand, are evaluated for interior fire exposures. The use of drywall shaftwall systems has been common for many years. 3-D full scale fire testing (e.g., ISO 6944) resulted in the first certification listing for an inherently fire-resistant duct.

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