Product Principle: Edit installed in the central air-conditioning duct system Hebei exhaust fan, works extremely fluxing temperature control Tianjin damper, use the force of gravity acting and spring mechanism closes the valve. When making a fire dampers, fire intrusion duct, high temperature melting fusible alloy valves, or to make memory alloy deformed the valve automatically closes, for air duct with a fire district occasions throughout the air flow control valve: 2 structural principle three technical parameters 64,654,132 6,341,321,356 444444444444444444 21521 Hebei rich exhaust fan ventilation equipment _ _ dampers provided by Dezhou Plumper ventilation plant. Dezhou Plumper ventilation plant (www.frtfsb.com) (www.frtfsb.com) strong, credible, in Dezhou fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Plumper ventilation equipment into the brilliant and you work for a better future!