OVER PRESSURISATION VENT WITH ORIFICE REDUCTION UNIT AND INSTALLATION POSITION FIXING BLADE

The present invention relates to an overpressure vent for discharging increased pressure from an enclosed space in the event of fire and, more specifically, to an overpressure vent with an orifice reduction member and an installation position-variable fixed blade, which is fixed to the wall through the fixed blade having a wide face to correspond to various sizes of orifices in the wall, and in which the fixed blade is formed to be movable in the longitudinal direction of a body tube of the overpressure vent, thereby being fixed to the wall to correspond to various wall thicknesses, and in which it is easy to reduce the inner diameter of the entrance of the overpressure vent such that the overpressure vent can be installed in various places through one product.