Fire damper is installed in the ventilation, air conditioning system, the return air duct on the road, usually was turned on, the gas inside the pipe when the temperature reaches 70 ℃, the circular fire dampers, fusible film fuse, the valve in the torsion force automatic closed within a certain period of time to meet the fire resistance stability and fire integrity requirements, from the effects of smoke fire retardant across the valve. Duct dampers when the valve is closed, the output signal is turned off. Fire and smoke control valve, normally open, 70 degrees closed damper, with one, but more than a telecommunications signal input, remote control can eliminate the control room is closed, generally used for peacetime air, fire, wind up in a common duct system air dampers When the fire can be controlled wind up turning off unneeded rooms; exhaust port if you have installed the necessary piping exhaust valves, use an ordinary single-Grille to; otherwise required plate discharges, it also with smoke damper mechanism. _ Rich proof ventilation dampers (certified) _ damper provided by Dezhou Plumper ventilation plant. Dezhou Plumper ventilation plant (#) is a leader in Dezhou, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Rich ventilation equipment in leadership with the staff warmly welcome all inquiries negotiations to create rich, ventilation a better future.