Acoustic Louver, Acoustic Door, Acoustic Enclosure manufacturer / supplier in China, offering HVAC and Mvhr Acoustic Splitter Duct Attenuator for Ductwork Sound Reduction and Ventilation, Ncc Weather Louvers Metting International Standards with America and British Certification, Louver Door: Unrivaled Noise Reduction for Mechanical & Electrical Systems in Ventilation and so on.