Exhaust valve installed in the exhaust system of the pipeline, the general was usually closed damper, manual or electric opened fire, from the smoke effect. When the internal temperature of the flue gas exhaust pipe reaches 280 ℃ cheap damper 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, open telecommunications No. 280 degree smoke dampers closed fuse, or manually shut down) generally used in exhaust systems, exhaust fan in the inlet dampers installed a remote control, control by eliminating open fire control room, but also when closed chain closes the exhaust fan. 2.2 normally closed smoke damper, the following functions: normally closed smoke damper, also known as secondary smoke damper action. 2.2.1 usually was normally closed when the fire broke out, by the control center DC24V power input, output valve 2.2.2 quickly open the valve opening signal, interlock control fire exhaust fan fan coil type: Horizontal concealed fan coil pipe fan coil surface mounted horizontal, vertical concealed fan coil units, fan coil vertical surface mounted, wall-mounted fan coil units, fan coil units and other high column; fresh air unit categories: Ceiling new air unit, vertical new air handling units, air handling units, etc. The new horizontal; simple damper, Plumper ventilation equipment (certified), the damper is provided by Dezhou Plumper ventilation plant. Dezhou Plumper ventilation plant (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, and satisfy customer needs. Rich ventilation equipment in leadership with the staff warmly welcome all inquiries negotiations to create rich, ventilation a better future.