Exhaust valve installed in the exhaust system of the pipeline, the general was usually closed, manual or electric opened fire, from the smoke effect. When the internal temperature of the flue gas exhaust pipe reaches 280 ℃ closed within a certain period of time to meet the fire resistance stability and fire integrity requirements, from the exhaust valve function. Smoke damper normally closed (NC, telecommunications No. smoke duct dampers open vendor 280 degrees blown off, or manually turn off) generally used in exhaust systems, exhaust fan can be installed at the inlet of a fire When controlled by the consumer control room open damper size 70, can also be turned off when the chain closes the exhaust fan. The duct smoke dampers mainly for ventilation and air conditioning systems, usually in a "normally open" state, when the air temperature reaches 70 ℃ damper, through the inner valve fuse action and shut down automatically. Exhaust port, exhaust valve is mainly set in the pipe exhaust system, or installed in the inlet of the exhaust fan fire, usually with smoke damper is closed when the fire, through interaction, automatically turn on the exhaust . 2015 fire dampers price, rich ventilation equipment (certified), Jinzhong dampers 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.