The duct smoke dampers mainly for ventilation and air conditioning systems, usually in a "normally open" state damper machine, when the air temperature reaches 70 ℃, by internal fuse action valve automatically closes. Exhaust port, exhaust valves main round damper settings on the pipe exhaust system, or installed in the inlet of the exhaust fan fire, usually turned off, when the fire damper plant, through linkage, automatically open row smoke. Air flow control valve is used for a wide range of mining, civil construction HVAC systems, air flow is accurately adjusted, is one of the key equipment to achieve a variety of environments under the control of ventilation modes. Its main feature is flexible operation, low noise, small amount of leakage, (closed type leakage <0.5%) Operating temperature region wide, reliable structure, safe and convenient. Damper 70 ℃, Plumper ventilation equipment (certified), Korla dampers provided by Dezhou Plumper ventilation plant. Dezhou Plumper ventilation plant (www.frtfsb.com) (www.frtfsb.com) is a leader in Dezhou, fans, ventilation equipment, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum limits to meet customer needs. Rich ventilation equipment in leadership with the staff warmly welcome all inquiries negotiations to create rich, ventilation a better future.