Wire shelf units that are stationary are ideal for situations where they will not be moved frequently. If fire sprinklers are triggered, air can flow through the wire shelving for ventilation, and water can flow through the shelf for fire protection. It allows items on the shelving to be seen through it, and dirt and dust fall through it to keep it clean. These floor-standing shelf systems provide numerous layers of storage for organizing and staging tools, supplies, and inventories. Without having to mount shelving to a wall, they make optimal use of vertical space in supply rooms, stock rooms, and other storage locations.