NFPA 92-2018 Standard for Smoke Control Systems

NFPA 92-2018 Standard for Smoke Control Systems. 4.1 Design Objectives. 4.1.1* The methods for accomplishing smoke control shall include one or more of the following: (1) The containment of smoke to the zone of origin by estab‐ lishment and maintenance of pressure differences across smoke zone boundaries (2) The management of smoke within a large-volume space and any unseparated spaces that communicate with the large-volume space 4.1.2* The specifc objectives to be achieved over the design interval time shall include one or more of the following: (1) Containing the smoke to the zone of fre origin (2) Maintaining a tenable environment within exit stairwells for the time necessary to allow occupants to exit the building (3) Maintaining a tenable environment within all exit access and smoke refuge area access paths for the time necessary to allow occupants to reach an exit or smoke refuge area (4) Maintaining the smoke layer interface to a predeter‐ mined elevation in large volume spaces 4.2 Design Basis. 4.2.1* Smoke Containment Systems. A smoke control system in a given building shall be designed to contain smoke to a given zone or keep smoke from entering another zone. 4.2.1.1 The design pressure difference shall be based on the following: (1) Whether the smoke zone is sprinklered (2) The height of the ceiling in the smoke zone (3) Maximum and minimum pressure differentials 4.2.2 Smoke Management Systems. The design basis for smoke management within a given large-volume space and any unseparated spaces shall include the determination of the following parameters: (1) The design basis fres used to calculate smoke production (i.e., type, location, and quantity of fuel for each design basis fre, extent of coverage and reliability of automatic suppression, and extent and type of ventilation) (2) Height, cross-sectional area, and plan area of the large- volume space to be protected 4.3 Design Approaches. 4.3.1 Smoke Containment Systems. The design approach for smoke containment systems shall be one of or a combination of the following: (1) Stairwell pressurization (2) Zoned smoke control (3) Elevator pressurization (4) Vestibule pressurization (5) Smoke refuge area pressurization 4.3.2* Smoke Management Systems. The design approach for smoke management within large-volume spaces and communi‐ cating spaces shall be one of or a combination of the following: (1) Natural smoke flling of an unoccupied volume or smoke reservoir and calculating or modeling of smoke layer descent to determine whether the smoke layer interface will...