accommodated within the sealed interspace defined by the two glass surfaces of a glass box including two or more glass surfaces spaced apart by an aluminum frame which contains the molecular sieve the venetian blind is provided with control members which allow adjustment of packing and or inclination of its blades from outside the glass box without altering the seal and therefore the functionality of the same operation from the outside of the control members inside the glass box is achieved for each adjustment by magnetic coupling through one of the glass surfaces of the glass box between a first magnet positioned inside the glass box and directly connected to the respective control system and a second external magnet application_number US 4988587 A description with reference to the figures a venetian blind according to the invention generally indicated at 1 comprises a plurality of blades 2 forming blind slats and connected to the upper side 3 of a perimetral frame 4 suitably formed as is better illustrated in fig6 of a c shaped profile having a thickness which is approximately the same as the inner interspace 5 of a glass box 6 accomodating the frame 4 this glass box 6 as is known essentially comprises of a pair of glass surfaces respectively outer 7 and inner 8 kept spaced apart from one another by an aluminum framework 9 which contains a molecular sieve 10 and is sealingly connected to the glass surfaces by means of sealing elements 11.