nfpa 92: standard for smoke control systems is a standard published by the nfpa that provides requirements, recommendations, and guidance regarding the design, installation, acceptance testing, operation, and ongoing periodic testing of smoke control systems. these approaches, along with the smoke management system approaches, are contained in figure 1, which should help to clarify the major design terminology used in nfpa 92. chapter 4 also contains several design requirements and criteria for smoke control systems. while these and other requirements apply to all smoke control systems, nfpa 92 also contains some requirements and criteria that apply exclusively to either one type of system or the other.
this requirement applies to the majority of smoke management system designs, as three of the four possible design objectives contained in section 4.1.2 fit this description. section 5.1 specifies three different methods that can be used for the design of a smoke management system: nfpa 92 does not contain calculation procedures for smoke containment systems. william e. koffel is president of koffel associates and is a member of the nfpa technical committee on smoke management systems.
anyone who has spent time navigating a building or fire code will quickly come to realize the importance of definitions, and that is ever clear when posing this question – when is stairwell pressurization required? something about the codes that we may lose sight of is that not too much is absolute. however, just because the building meets the definition of a high-rise does not necessarily imply that every stairwell, or any stairwell for that matter, is required to be provided with stairwell pressurization. the objective of a smokeproof enclosure is to prevent the migration of smoke from the area surrounding the stair into the stair enclosure.
note, as seen in this approach, a smokeproof enclosure is not necessarily always a stairwell pressurization system. however, stating that stairwell pressurization is not a code requirement may be a stretch, as it is a popular “alternative” to providing the required smokeproof enclosures. a stairwell pressurization system is considered a smoke control system and is subject to the many requirements of chapter 909 in the building code. understanding when stairwell pressurization is required for a building is important because it means you may be subject to various rules and regulations.
in this case, nfpa 92 tells us “how” to design smoke control systems such as stair pressurization, large volume exhaust, and elevator a type of smoke-control system in which stair shafts are mechanically pressurized, with respect to the fire area, with outdoor air to keep smoke from pressure difference = 0.18 in wg between staircase and adjacent accommodation space (nfpa 92a, table .1). b. δp max. = max. pressure difference = 0.37 in, stair pressurization code requirements, stair pressurization code requirements, ibc stair pressurization requirements, stairwell pressurization ashrae, nfpa 92a.
the code simply requires that every exit stair serving floors more than 75 feet above the lowest level of fire department access shall be a “smokeproof nfpa has a host of standards and codes that are used to help us design, install, test, inspect and maintain fire and life-safety systems. refer to ifc, section 909 (or nfpa 1 where applicable) and nfpa 92 for a complete submittal list. submit the number of plans as required by the specific, stairwell pressurization, stairwell ventilation requirements, stairwell pressurization testing requirements, stair pressurization testing and commissioning, stair pressurization fan, stairwell pressurization testing frequency, stairwell pressurization calculation excel, smoke control testing requirements, staircase ventilation design, staircase pressurization system design.
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