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Medium Duty Racking, belonging to a type of storage shelves, shelf type. It is distinguished and named according to the carrying capacity of the shelf. According to this division principle, medium duty shelves are between light shelves and heavy-duty shelves, hence the name medium-sized shelves. 
The medium duty shelves are assembled from columns, beams and laminates. The independent group has two columns. The shelves are called main frames. If several groups are assembled into one column, then in addition to the first group requiring two columns, the other can share a column with the group in front of it, such a shelf is called a sub-frame.