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Natural venting to control smoke movement in buildings via vertical shafts

From National Research Council Canada

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  1. National Research Council of Canada
FormatText, Article
Conference1970 ASHRAE Semi-Annual Meeting, June 28 - July 1, 1970, Kansas City, Missouri, United States
SubjectSmoke management; smoke; stack effect; natural ventilation; vent outlets; air flow
Abstract
Air 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.
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  • ASHRAE Transactions 76, no. 2 (1 January 1972): 279–289.
LanguageEnglish
Peer reviewedYes
IdentifierDBR-RP-510
NRC numberNRCC 12357
NRC-IRC-3880
NPARC number20375921
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Record identifierb7997028-e9f8-43c9-83a4-08189c1250c8
Record created2012-07-23
Record modified2024-01-19
Date modified: