We offer high-quality Pass Box which is created to work as a safe passage to transfer materials, tools or items from unclassified to classified area. The product is such that one can transfer the material from one room to another even without opening the door. It has two doors which are interlocked in unique way to not get opened simultaneously. The interlocking of the controllers makes sure that that when one door is open, the other one remains closed. This is how it becomes possible to maintain the higher level of room cleanness by storing the direct flow of air or other bacterial contamination from one room to other. The pass box controller is responsible to stop the simultaneous access of doors.