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Modulate supply airflow (variable speed fans) 2. Compensates for varying pressure differentials and door statuses and maintains constant pressure differences across openings.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 – NONCOMPENSATED SYSTEMSįan Types Permitted: 1) Centrifugal fans 2) In-line axial fans
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STAIRWELL PRESSURIZATION – MULTIPLE POINT INJECTION This requires large amounts of outside air which may need to be pre-heated in cold climates to prevent damage to building systems. oġ) Noncompensated 1) Single point 2) Multiple pointsĢ) Compensated a.
#Nfpa 92a pdf code#
2000 – 2012 International Building Code requires smoke control for: .1994 Uniform Building Code – contained analytical methods that were based on criteria in NFPA 92A.NFPA 204M, Guide for Smoke and Heat Venting , adopted in 1961.Alternatives to fire walls/barriers were sought Technology gy research.Number of large loss fires occurred where smoke was deemed a contribution factor.Provide an overview of smoke control/NFPA 92 –ĬHAPTER 1 – ADMINISTRA ADMINISTRATION TION CHAPTER CHAP TER 2 – REFER REFERENCE ENCES S CHAPTER CHAP TER 3 – DEFIN DEFINITION ITIONS S.SMOKE CONTROL SYSTEM OVERVIEW NFPA 92 A Webinar