The assembled finished smoke exhaust duct has both inner and outer surfaces made of metal material, and the middle layer is made of high-density ceramic fiber cotton board, which has excellent fire resistance and a unit weight of ≥ 110Kg/m3.

The air duct is connected with galvanized angle iron flanges to ensure its tightness and strength, and comply with the requirements of the "Code for Acceptance of Construction Quality of Ventilation and Air Conditioning Engineering" GB/T 50243-2016. The fire resistance integrity and insulation of the air duct meet the requirements of the Technical Standard for Building Smoke Control and Exhaust Systems (GB51251-2017). It has the advantages of easy installation, beautiful appearance, long service life, good insulation performance, and excellent fire resistance, meeting the air volume requirements of smoke control systems.