Shandong damper producer - Shandong Which produced the best damper. Direct sales hotline: 13573487358 How to choose dampers? Here to explain: 1. damper main control parameters for the selection and specification. 2. damper suitable for ventilation and air conditioning systems, in addition to public buildings, kitchen hood system with dampers, operating temperature of 150 ℃, the general ventilation and air conditioning systems with fire dampers operating temperature of 70 ℃. 3. The damper is suitable for pipe ventilation, air conditioning or exhaust system. 4. The selection of valve should pay attention to the function of the valve, normally open or normally closed, shut down automatically open, close the open hand, manual reset, signal output, remote control and other requirements. 5. If the valve and fan interaction should be used with double micro-switch device. 6. The valve should be steel blade thickness of 2 ~ 6mm, the body of non-combustible materials, rotating parts should be corrosion-resistant metallic materials, and flexible rotation. Shall not be less than the thickness of the valve housing 2mm. Yi Rong parts shall comply with recognized standards of the fire department. Dampers, normally open, 70 degrees or 280 degrees closed, usually installed in the duct through the firewall, fires off the role, you can set the output electrical signal, the temperature exceeds 70 degrees or 280 degrees valve is closed, the linkage to send (s) the fan is off.