E - Fixed Constructions – 04 – F
Patent
E - Fixed Constructions
04
F
E04F 17/04 (2006.01) E04H 9/00 (2006.01) F24F 7/00 (2006.01) F24F 11/00 (2006.01)
Patent
CA 2426391
A stairwell pressurization system may be installed in either new or existing low-rise or high-rise buildings and has at least one air duct and a fan system consisting of one or more fans which are operable to force substantially smoke-free air into the duct under a positive pressure. One or more air outlets are provided on the duct in the stairwell in the vicinity of each hallway exit door leading into the stairwell. The air outlets are most preferably vertically elongated and oriented so as to direct air from the duct at the opening edge of the stairwell entrance door. The air outlets are electrically, electronically or physically connected to the stairwell door so as to be selectively opened or closed with the movement of the adjacent door. In a simplified construction. one of the elongated air outlets opens into the duct and is normally maintained in a non-air flow position by a baffle door which is moved to open or close the air outlet. The stairwell entrance door has one end of a pulley cable coupled thereto, with the other end coupled to the baffle door. The baffle door is connected by a pivot and is biased in a closed position by a spring. As the stairwell entrance door is swung open. the pulley cable is drawn therewith. moving the baffle door so as to be opened together with the stairwell exit door. Air is then directed from the pressurized air duct through the elongated air outlet and along the open edge of the stairwell door. As the door progressively opens, the air outlet opens wider to direct more air from the pressurized air duct at the stairwell door through an elongated air outlet.
Bergman George
Na
LandOfFree
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