VENTILATION SYSTEM

摘要

PURPOSE: A ventilation system is provided to allow the ventilation air volume to be easily adjusted while achieving perfect air tightness of the ventilation system during an off period of ventilation system. CONSTITUTION: A ventilation system comprises a hollow square frame(3) formed by an assembly of an inner frame(3a) and an outer frame(3b) having square C-shaped cross sections, respectively; panels(4,4') formed of a plate having a plurality of perforations(4a) and which are coupled to front and rear surfaces of the frame; a rotation shaft(5) having upper and lower ends inserted into holes(15a,15'a) of brackets(15,15') fixed to upper and lower ends of the inner frame, and coupled through nuts(15b,15'b) so as to be rotatable in vertical direction within the frame; a blade(6) accommodating the rotation shaft and which rotates by the rotation of the rotation shaft so as to control the air flowing through the frame; and an adjusting knob(7) for controlling the rotation of the rotation shaft.