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Sound absorbing box The sound-absorbing box covers a wide range of use and it is carefully designed to effectively achieve noise attenuation of each type of fan. The external structure is entirely composed of galvanized panels and sound absorbing material which allows a considerable reduction of sound energy. Benefits The structure is composed with galvanized-sheets panels, coated with soundproof material.The panels are smontable, in order to allow inspections inside the structure. The soundproof-material is composed with by wool rock. Standard equipment Anti-vibration joints for connection from the fan to the box