Racks and shelving are both types of storage systems that are used in cleanrooms to organize and store items. The main difference between a rack and shelving in a cleanroom is that a rack typically has vertical columns and horizontal shelves that are adjustable or fixed in place, while shelving typically consists of horizontal shelves that are supported by brackets or posts. Racks are typically used in cleanrooms for storing and organizing heavy or bulky items, such as boxes, pallets, or containers, while shelving is typically used for storing and organizing smaller or lighter items, such as chemicals, samples, or tools. Additionally, cleanroom racks are typically made of materials that are easy to clean and disinfect, and are designed to minimize the potential for contamination. Cleanroom shelving is also typically made of materials that are easy to clean and disinfect, and is often equipped with features such as laminar flow or HEPA filtration to help maintain the cleanliness of the stored items. Overall, the main difference between racks and shelving in a cleanroom is the type of items they are used to store and organize, and the materials and features they are made of in order to minimize the potential for contamination.