When we want to pass some material through a pass box, we insert the material into the pass box and lock the doors from both end. Then the AHU is turned on and UV lights are activated. After a certain time (say 1 minute) the pass box can be opened and the material transferred to the other side.
My question is on what basis does the holdover time in pass boxes depend on? How to determine the time length for maintaining interlocking in a pass box?