Industrial Grade Fire Damper is provided on air/ gas ducts to control flow under normal circumstances and to isolate areas connected by duct from the fire affected area. The Fire Damper comes with single flap or multi-louvers which are made from quality grade mild steel. The Fire Damper has a complex shape that reduces the leakage factor considerably and due to high insulation it can withstand high temperature. Industrial Grade Fire Damper enables thermal expansion of the louver/ flap without affecting sealing areas.