Supply of anti-noise systems consisting of a support structure built in processed and hot-dip galvanized commercial steel, subsequently painted at the customer's choice. External cladding in sound-absorbing modular panels insulated with coibe, external casing in full galvanized and painted steel sheet, with the perforated side facing the source of the noise equipped with block handles to make them removable where required for maintenance. Intermediate diaphragm to divide the suction from the expulsion. mineral rock wool