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Fully Automatic Fire Damper Controller, Fire Exhaust Actuator, Hand and Electric Integrated 70 ° C and 280 ° C Temperature Sensor, Find Details and Price about Fully Automatic Fire Damper Fully Automatic Mechanism from Fully Automatic Fire Damper Controller, Fire Exhaust Actuator, Hand and Electric Integrated 70 ° C and 280 ° C Temperature Sensor - Beijing Yutian Chengxue Technology Co., Ltd.