The present invention relates to an insulated glazing unit (1) comprising a support frame (2); a pair of at least partially transparent panes (3) sealingly fixed to the frame (2) to define a gap (4); a screening element (5) that is adapted to be deployed within said gap (4) to be switched between an open configuration, and at least one closure configuration; a control unit (9) comprising an actuator module (10) associated with the screening element (5) to control deployment of the screening element (5); a pressure sensor (11) configured to send a signal representative of an internal pressure value (Pi) in said gap (4) to the control unit (9).