Industrial roof ventilator. Australian made. Silver finish. Supply only - installation is not included. Must be installed by a licensed installer. Refer to the manufacturer's installation instructions supplied with the product. Specifications • Head width: 770 mm • Head height: 450 mm • Base height: 400 mm • Vent throat: 600 mm • Flashing base: 800 (W) x 1200 (L) mm • Base type: Square to Round