HIHUAY .COM We are a cleanroom wall and ceiling systems and cleanroom equipment provider based in the PRC and Malaysia. We provide a comprehensive range of cleanroom products and services, including the development, production and installation of cleanroom wall and ceiling systems, and cleanroom equipment such as fan filter units (which filter and regulate air flow in a cleanroom), air showers, pass boxes and HEPA filters. Our products are mainly used in cleanrooms of different classes in various cleanroom standards, including the most stringent cleanroom class under the FED-STD-209E standard.