Developing an NFPA 92 design analysis

摘要

Smoke control systems typically are designed to meet the requirements of a prescriptive building or fire code or as part of a performance-based design or compliance alternative. The standard that is typically used for the design of such systems is NFPA 92: Standard for Smoke Control Systems. The 2012 edition of NFPA 92 combined what had been previously published as NFPA 92A and NFPA 92B. There also are smoke control system design requirements found in the International Building Code, which may differ from the NFPA 92 requirements. For example, the IBC provides pressure differences to be achieved for a smoke containment system designed for stair pressurization that are different from those in NFPA 92. However, this is based on the NFPA 92 pressure differences are to be achieved when the number of stair doors assumed to be open are open. The IBC indicates that the pressure differences are to be achieved with all interior stair doors closed. The design professional needs to be aware of the design criteria of the applicable codes and standards. Like many NFPA codes and standards, NFPA 92 is typically revised on a three-year revision cycle. The technical committee currently is working on developing the 2021 edition and the work of the committee can be followed using www.nfpa. org/92. The current edition is the 2018 edition and will be referenced in this article.