
Their shelves optimize the vertical laminar airflow inside a cleanroom and minimize the possibility of particle accumulation. Racks have three rod shelves, made of .25 inch-diameter rods on 2 inch centers and are mounted at a 17� angle to position WIP boxes securely against a rear retaining rod. Side flanges keep materials from slipping off the side edges. Shelves are designed for optimal storage densities of common wafer transport cassettes and WIP boxes.