In the following circumstances ventilation, air-conditioning duct system should be set damper: (1) pipeline crossing the wall of the fire district; (2) pipeline crossing ventilation, air conditioning and major engine room fire hazard or a large room Partition walls and floor at; both sides (3) vertical and horizontal pipe duct duct junction of each level (4) pipeline crossing movement joint. Installed in the ventilation, air conditioning system, the return air duct way, Texas damper, usually was turned on, when the gas pipeline fire when the temperature reached 70 ℃, fusible film fuse, Hing'an dampers, valves torsion spring force the role of automatic shutdown, damper effect, within a certain period of time to meet the fire resistance stability and fire integrity requirements, since the role of smoke fire retardant effect of the valve. When the valve is closed, the output off signal. Hing'an damper, Yanda air conditioning, fire dampers distribution by Wu County Yanda air-conditioning plant. Hing'an damper, Yanda air conditioning, fire dampers distribution is Wu County Yanda air-conditioning plant (www.wcydkt.com) (www.wcydkt.com) this year introduced a new upgrade, the above picture is for reference only, please call Tel This page or image on to obtain the latest information, contact: Wu Yusong.