Exhaust valve installed in the exhaust system of the pipeline, the general was usually closed fire fighting equipment, fire or electric open manually, 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. open fire dampers, fire dampers offer 280-degree turn off the fuse or manually shut down) generally used in exhaust systems, you can install an exhaust suction fan, when the fire by Consumers control room control is on, when you close the chain also closes the exhaust fan. 400 × 200 455 × 255 485 × 285 8 5 3 16-?14 200 245 164 245 180 675 712 805 195 210 210 400 × 320 455 × 375 485 × 405 8 5 3 16-?14 200 245 164 245 240 785 772 865 263 260 260 50 × 200 555 × 255 585 × 285 8 5 3 16-?14 220 245 164 220 245 200 245 240 785 772 865 292 312 320 dampers offer, rich ventilation equipment (certified), Qingdao, Shandong Dezhou damper by Rich ventilation plant available. 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.