Industrial Grade Duct Damper is provided with opposed blades, which are used to carry out a rough air system balance with closer control being carried out at the individual grilles or diffusers. The Duct Damper is made using quality grade aluminium or galvanized steel and offered with high dirt removal capacity. The Duct Damper is installed in branches of air distribution ducts. Industrial Grade Duct Damper is designed for long lasting usage and need less maintenance.