Through rack is also called corridor rack or Drive-in racking . The through rack can be used for forklift (or unmanned truck with fork) to drive into the channel to access goods. It is suitable for the storage of goods with small varieties and large quantities. In addition to the storage space close to the passage, the depth of 7 storage spaces is not recommended for single side picking up, because forklifts need to enter into the storage space to store and store goods. In order to improve the operation speed of forklift trucks, guide rails can be selected according to the actual needs. Compared with storage space shelves, the utilization rate of storage space of through shelves (drive in shelves) can be increased by more than 30%. Through shelves (drive in shelves) are widely used in wholesale, cold storage, food and tobacco industries. The design principle of through rack, also known as drive in rack, is to connect several rows of traditional racks, with special lanes, and the same lanes are used for forklift access. When it is stored, it shall be stored from the inside first, and then in order to the outside. When it is shipped, it shall be taken out from the outside first, and then in order to the inside. The storage density is very good, but it cannot be first in, first out. It is suitable for material warehouse or transfer warehouse with high frequency of periodical batch operation and material storage. http://www.keenracking.com