Acoustic insulation to airborne noise of elbow of downcomer, with mineral wool

Acoustic insulation to airborne noise of elbow of downcomer of 90 mm diameter, made with glass wool blanket, according to UNE-EN 14303, covered by one of its faces with aluminum reinforced acting as vapor barrier, of 30 mm thickness, for insulation of air ducts in air conditioning, thermal resistance 0.86 m²K/W, thermal conductivity 0.035 W/(mK); with 39.76 dB global reduction index of acoustic insulation, Rw, according to UNE-EN 14366; providing an improvement of the global reduction index of acoustic insulation weighted A of 9.43 dBA, in downcomers with medium flow of 60 l/min; disposed around the downcomer in the form of a coquilla and fixed with plastic bridges. Including self-adhesive tape for sealing of joints.