The special crane for clean room is specially used for industrial clean room and biological clean room with strict requirements on cleanliness. The application environment of clean room crane usually requires high cleanliness, and a large amount of dust is not allowed. The interior is generally dominated by white tone. According to the cleanliness, the special crane for clean room is generally divided into class 100, class 1000, class 10000 and class 100000. Class 100 has the highest requirements for cleanliness, and class 100000 has relatively low requirements for cleanliness. Cleanliness level the specifications of cleanliness of clean rooms in the world include American standards, ISO standards, JIS standards, etc. According to different standards, the regulations on the volume and diameter of dust are also different. Please pay attention to the selected specifications. General  class is the number of dust with a diameter of more than 0.5um in 1 ft of air in the American Standard (fed. Std.209d). 209d was updated to 209E in 1991 and 209E was abolished in 2001. Iso14664-1 standard was published in 1999, and ISO standard is gradually adopted as the base in the world.