Exhaust valves, with the three, each unit different names, some based on its operating temperature is called the exhaust valves, and some based on its use of nature called the fire damper smoke fire dampers stock, but only for the equipment side of the ordinary fuse metal damper 280 degrees into that kind of fuse. damper smoke fire damper, smoke damper normally open most widely used and 70 degrees closed, usually installed fire shutdown role duct through the firewall, starting at Warlords smoke damper manufacturer can set the output electrical signal, automatic smoke damper temperature exceeds 70 degrees when the valve is closed, the linkage to send (s) off the fans; smoke damper of stock _ _ Zhangjiakou Yanda air conditioning smoke Wu County fire damper is provided by Yanda air-conditioning plant. Wu County Yanda air-conditioning plant (www.wcydkt.com) (www.wcydkt.com) quality of service and products, continue to receive the recognition and trust of new and old customers and the industry. Our company is a certified member of the whole network Commercial Union, Commercial Union customer service icon on the page, you can talk directly with our customer service staff, to our future cooperation happy!