Abstract: The present Invention relates to an overpressure-based system applied to protect vertical evacuation routes against smoke infiltration, that can be used in the objects such as hospitals or laboratories, where it is necessary to accurately maintain the pressure difference between two zones on a preset level, characterised in that the system's controlling & working unit 14 is connected with the upper fan's frequency converter 19 through the upper fan's controller 15, and, next, through the reversible upper fan 4, and this system's unit is also connected with the upper fan's frequency converter 20 through the lower fan's controller 16. and, next, with the reversible lower fan 5.

Abstract: The present Invention relates to a method of controlling pressures in vertical escape routes for the purpose of securing vertical escape routes, characterised in that the amounts of supplied and discharged air depend on the temperature value in the vertical escape route 1 and the external temperature, which are transmitted from the temperature sensor 4 located in the vertical escape route 1 and from external temperature sensor 5 into the central control unit 6, which activates, based on the computed difference of temperatures, the reversible upper fan 7 and the reversible lower fan 8, as well as the upper pressure-regulating governor 9 and the pressure-regulating governor 10.