"20FR" usually refers to a 20 Foot Flat Rack Container.

　　The frame cabinet is a special container, which is characterized by no top and wall of the box, only the bottom of the box and four corner posts. This kind of cabinet is mainly used for transporting some ultra-long, ultra-wide and ultra-high goods, such as large mechanical equipment, steel structure, glass and other goods that cannot be loaded into ordinary containers.

　　Compared with ordinary 20-foot standard containers, 20-foot frame cabinets are more flexible in the adaptability of cargo size and shape, but relatively weak in terms of cargo protection and sealing.