STAIRWELL PRESSURIZATION – COMPENSATED SYSTEMS

Work best in buildings where doors are not opened very often or for very long Įxample: Low occupant load buildings such as luxury apartment buildings.

Pressurization level varies based on how many doors are open or closed.

Does not compensate for changes in pressure differentials or door status.

Supply air intake required to be separated from all building exhausts, outlets from shafts, vents, etc. Duct can be located in stair instead of separate shaft. The more vertical space between injection points, the harder it is to balance. Injection points and fans can be located at any level. STAIRWELL PRESSURIZATION – MULTIPLE POINT INJECTIONġ) Centrifugal fans 2) In-line axial fans STAIRWELL PRESSURIZATION – NONCOMPENSATED SYSTEMS This requires large amounts of outside air which may need to be pre-heated in cold climates to prevent damage to building systems.

Parts a, c, and e show all nonsmoke zones in the building being pressurized during a fire.

A smoke zone can also be limited to a portion of a floor (e).

Each floor can be a smoke control zone (a and b), or a smoke zone can consist of multiple floors (c and d).

Variety of possible design configurations.

SMOKE CONTAINMENT – ZONED PRESSURIZATION SMOKE CONTAINMENT – STAIR PRESSURIZATION TYPES (ANNEX F)

NFPA 101, Life Safety Code® requirements ĭetention and correctional Covered malls (over two levels) Atrium (over three levels)ĭESIGN FUNDAMENTALS CHAPTER 4 – DESIGN FUNDAMENTALS.

Smoke protected assembly seating Atriums over certain height Underground or windowless buildings Proscenium openings Smokeproof enclosures (stairs, elevators) 2000 – 2012 International Building Code requires smoke control for:     .1994 Uniform Building Code – contained analytical methods that were based on criteria in NFPA 92A.

Smoke management systems (atrium/mall) Stair pressurization Elevator pressurization Zoned smoke control Atrium smoke management What does NFPA 92 cover? What does it not cover? NFPA 204M, Guide for Smoke and Heat Venting, adopted in 1961.Illinois Institute of Technology research.Alternatives to fire walls/barriers were sought.Number of large loss fires occurred where smoke was deemed a contribution factor.Provide an overview of smoke control/NFPA 92 – – – – –Įvolution of smoke control Design fundamentals Calculation procedures Building equipment and controls Documentation TestingĬHAPTER 1 – ADMINISTRATION CHAPTER 2 – REFERENCES CHAPTER 3 – DEFINITIONS.

SMOKE CONTROL SYSTEM OVERVIEW NFPA 92 A Webinar

Nfpa 92 pdf