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防烟防火调节阀安装在有防烟防火及需要进行风量调节的通风空调系统的风管上，平时常开，发生火灾时关闭。手动复位开启阀门。
1, The scope of application andthe principle:
Smoke and fire damper is applicable to theventilation, air-conditioning duct with flow volume control and fire preventiondemand. Usually the damper is open. when fire occured, the fuse plug promptlyclose automatically. Manually open the damper to reset the system.
