Introduction of a fire outlet, product selection points 1. Fire vents for ventilation and air conditioning systems end, the operating temperature of 70 ℃. Need to send the exhaust port when the fire cut off the source of fire. 2. If the fan vent fire linkage should be used with double micro-switch device. 3. outlet for non-combustible material, rotating parts should be corrosion-resistant metallic materials, and flexible rotation. Shell thickness of not less than 2mm. Yi Rong parts shall comply with recognized standards of the fire department. Second, the principle of operation device to manually rotate the lever can be adjusted within the range of 0-90 degrees valve opening, when the air flow temperature to 70 degrees, the valve is closed, reset, remove the vent, exchange new easy fused ring, and then adjust the valve opening, and put on air. Third, the construction, installation points 1. Fire outlet side of the operating mechanism shall be not less than 200mm of headroom to facilitate maintenance. 2. The installation must be checked before the fire vent outlet operating mechanism is intact, the action is flexible and effective.