Fire Damper is used to prevent the spread of fire inside the ductwork in heating, ventilation, and air conditioning (HVAC) systems. These Smoke Fire Dampers have fire-resistance rated walls and floors that prevent the spread of smoke inside the ducts. Due to these properties, these fire dampers are suitable for ventilation and air conditioning systems. The range is constructed from heavy gauge galvanized iron sheet having multiple opposed blade construction. The blades are fitted with chrome plated spindles operating in self-lubricating sintered bronze bushes with stainless steel side seal gaskets to prevent spread of smoke & fire. The operating linkage is fully enclosed.