Acoustic Louver, Acoustic Door, Acoustic Enclosure manufacturer / supplier in China, offering Engineered for Industrial Quiet: Rectangular Duct and Column Silencers for Cooling Tower Noise Control & Generator Room Ventilation, Column Silencer & Ventilation Rectangular Duct Silencer: Premier Noise Reduction for Cooling Towers and Generator Room Ventilation, Metal Column Matrix Silencer for Cooling Tower and Metro Tunnel Noise Reduction and so on.