ISO Cerified Company 
In the process of material transfer from unclassified area to classified area pass boxes are used. Pass box is rectangular box with two doors . The two doors are interlocked such a way that two doors cannot be open at the same time, due to which pressure losses and bacterial contamination doesn’t take place throughout the material transferring process .
The prevention of simultaneous access of doors is been achieved by our Pass Box controller by ensuring that when one door for a Pass box is open then other door is closed.