PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX PASS BOX is one kind of facilities, which located on partition walls of clean room and its function shall be a buffer area for transferring goods between inside and outside of clean room. So that, it can prevent any disturbance of airflow and air pressure in clean room, ...