Natural venting to control smoke movement in buildings via vertical shafts

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TypeArticle
Journal titleASHRAE Transactions
ISSN0001-2505
Volume76
Issue2
Pages279289; # of pages: 11
Subjectsmoke; stack effect; natural ventilation; vent outlets; air flow; Smoke management
AbstractAir movement caused by stack action can be an important means by which smoke spreads from floor to floor. With a fire in a lower floor, smoke spreads from the fire floor to upper floors mainly through vertical shafts. This paper examines the control of shaft pressures by natural venting to prevent smoke entering a shaft or if it does, to provide for its being exhausted to outside. Top venting increases smoke contamination of the shaft; bottom venting inhibits the flow of smoke into the shaft from contaminated floors. Factors affecting optimum vent sizes for both top and bottom venting of shafts are examined. Top venting can assist in the evacuation of smoke originating from fire in a shaft. The vent size required, however, is much greater than that required for the case with a fire in a lower floor.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
NotePresented at the 1970 ASHRAE Semiannual Meeting, Kansas City, MO, USA, June 28-July 1, 1970
Peer reviewedYes
IdentifierDBR-RP-510
NRC number12357
3880
NPARC number20375921
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Record identifierb7997028-e9f8-43c9-83a4-08189c1250c8
Record created2012-07-23
Record modified2016-05-09
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