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1. The main selection of fire control parameters for the specifications and so on. 2 fire damper for ventilation and air conditioning systems, in addition to public buildings kitchen exhaust system fire damper, the operating temperature is 150 ℃, the general ventilation and air conditioning system with a fire damper operating temperature is 70 ℃. 3 fire damper for ventilation, air conditioning or smoke exhaust system on the pipeline. 4. Valve should pay attention to the function of the valve, normally open or normally closed, automatically closed open, manually closed open, manual reset, signal output, remote control and other requirements. 5. If the valve linkage with the fan should be used with dual micro switch device. 6. Valve blade should be steel, a thickness of 2 ~ 6mm, the valve body is made of non-combustible materials, rotating parts should be corrosion-resistant metal materials, and flexible rotation. Valve shell thickness of not less than 2mm. Easy to melt components should meet the approved standards of the fire department.