F - Mech Eng,Light,Heat,Weapons – 24 – F
Patent
F - Mech Eng,Light,Heat,Weapons
24
F
F24F 7/007 (2006.01) F24F 7/06 (2006.01)
Patent
CA 2405858
A stairwell pressurization system is interconnected to a fire alarm for simultaneous operation. As a result, when the fire alarm system is sounding, the pressurization system is used to create a positive pressure in the stairwell and prevent smoke or substantially reduce any smoke penetration into the stairways. The system includes one or more fans which are operated at the same time as the existing fire alarm system. The operation of the fans forces smoke free air from outside the building into the top and bottom of each stairwell. This creates a positive air pressure in the stairwell, which prevents the movements of smoke from the building hallways and common areas into the stairwells, creating a safe area for individuals to exit the building. The system maybe further configured to turn off any secondary roof top ventilation system which provides airflow to the building hallways or common areas. This advantageously reduces pressure from the common and hallway areas, resulting in enhanced airflow from the pressurized stairwells into the hallways. In case of stairwell exit doors being opened simultaneously, pressure sensors in the stairwells are used to sense a pressure drop. Upon sensing a pressure drop, the sensors are used to provide control signals to the fans to operate at increased power and speed until the pressure in the stairwell is returned to a desired level.
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